Terceira Island: Angra, The Caves And The Volcanic Interior

A World Heritage anchorage on a volcanic island

The historical center of Angra do Heroísmo has been recognized as a World Heritage site by UNESCO since 1983. It was inscribed under criteria (iv) and (vi), with a property of 212.40 ha. Visit Azores frames the city as the anchorage that resupplied the ships crossing the Atlantic, which is why the port and the old streets grew together.

The island behind the city kept its volcanic character. Monte Brasil is an old sea volcano, the largest and best preserved of the Azores, and it stands directly over Angra's bay. Down the east coast, Serra do Cume looks over what Visit Azores calls the geometry of the endless stone walls and fences of hydrangeas, a field pattern no other island shows at this scale.

The city deserves its own half day on foot, and angra do heroismo covers it in detail: the streets, the forts and the pastry stops. This page handles the rest of the island, the caves, the crater edges and the fumarole fields that sit within a short drive of the UNESCO zone.

Algar do Carvão, the chimney you walk into

This is a volcanic chimney whose crater opening measures 15 x 20 m and ends 90 m below at a lake up to 15 m deep, reached down 338 steps. Inside, the walls carry milky-white silica stalactites and reddish iron veins, and the cave's age is dated at about 2,148 years. It is an Azores Geopark geosite.

Management matters here: the site belongs to Associação Os Montanheiros, the volunteering association that received it as a donation, not to the regional parks network. Sessions run in the afternoon and the season changes the days, so check the hours section before you drive out.

Serra do Cume and the stone-wall plain

The viewpoint looks straight down on what Visit Azores calls the geometry of the endless stone walls and fences of hydrangeas. The patchwork below is the island's farmland, divided by basalt walls that have stood for generations. It is free open ground with no fee published, and the access road climbs from the east side of the island.

Morning light shows the wall pattern best, which is our estimate rather than an official line. Most people stop at the rail for twenty minutes and drive on, and that is enough, because the real sight is the scale of the pattern, not a single detail.

Monte Brasil

Monte Brasil is the old sea volcano that closes Angra's bay, described by Visit Azores as the largest and best preserved of the Azores. It is a peninsula now, and the trails up it start practically from the city streets, which makes it the easiest big walk on the island. The summit views take in the UNESCO town, the harbour and the open Atlantic.

It is free open ground with no published fee. Go early or late, because the exposed slopes get hot in the middle of the day, and the descent back into town ends conveniently at the pastry shops of the old quarter.

Furnas do Enxofre

A fumarole field where red soil sits against green moss and a distinct sulfur smell hangs over the ground. Steam rises from vents along a short walking circuit, and the colours come from the mineral chemistry of the soil. The official page states no entry price, so no fee is printed here.

It sits in the island's interior, close to the caves, so it slots naturally into the same drive as Algar do Carvão and Gruta do Natal. Plan for the smell rather than a long stay, wear shoes you do not mind dusting with sulfur-stained soil, and keep to the marked paths around the active vents.

The comparison

The two sites are different experiences a short drive apart, and the table shows where they differ.

Booking and paying at Gruta do Natal

Gruta do Natal takes no reservations and no online sales, payment is cash, Mastercard or Visa, and American Express is not accepted. Terceira blood-donor card holders get about 20% off. The algar do carvao page has the full detail on the chimney cave.

Hours by period

All figures below come from the operator's own pages.

Closure days

Both caves close on the same list: 1 January, Easter Sunday, 1 December, 25 December, Carnival Tuesday, 24 December and 31 December.

Construction warning

The Algar was closed for construction of the new CAVE visitor centre and visits resumed in March during the final construction phase, so short-notice suspensions are possible. Check the operator before a long drive.

Flights, ferries and the last 12 km

Azores Airlines sells Boston to Terceira (TER) and Toronto and Montreal to TER, so the island is one of the few in the archipelago with its own North America service. That makes it a rare case where you can land on a secondary island without changing in Ponta Delgada. On the water, Atlânticoline's Terceira ports are Angra do Heroísmo and Praia da Vitória, but the timetable is a dynamic search tool and no static per-route fares are published.

There is no Ponta Delgada ferry port, so from São Miguel the move is a flight. Once on the island, the cave sits about 12 km from Angra at roughly 640 m altitude, at GPS 38°43'41.54"N 27°12'59.01"W, and no public transport is published, which is exactly why the cave tours with transport sell. A rental car covers the interior easily in a day.

The wider island-hopping picture lives on getting around azores.

Routing by available time

Pick the row that matches your stay.

• The caves are run by a volunteering association, Os Montanheiros, which received the Algar as a donation in 1973 (montanheiros.com).
• The Algar's silica stalactites are milky white and the iron veins reddish, in a cave dated about 2,148 years old (montanheiros.com).
• Gruta do Natal caps its interior at 80 people and groups at 20, with no online sales at all (montanheiros.com).
• A combined cave ticket exists at a reduced price but is not sold during the CAVE visitor-centre works (montanheiros.com FAQ).
• Furnas do Enxofre publishes no entry price on its official page (visitazores.com).