The tallest residential building in Africa is an unsettling Brutalist monolith.

Caves that can't seem to quit producing the remains of prehistoric humans.

A safari-themed castle in the South African bush with the largest maze in the southern hemisphere.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

Largest cave system in Africa.

These otherworldly caverns form Earth's oldest known cave system.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

One of the most important Krio heritage sites in the country.

The first European-style university in western Sub-Saharan Africa.

Home of the ruins of a British slave castle.

This river island in Sierra Leone is home to impressive biodiversity and the country's first community conservation program.

You can find more than 200 species of tropical plants at this garden owned by a former ambassador.

The remains of a 19th-century school and living quarters are perched atop a mountain surrounded by a thick tropical forest.

A schooner, nicknamed "The Unsinkable," with a long history of survival in the Indian Ocean.

In the middle of a busy residential neighborhood, a small roofless church being reclaimed by nature.

Over two-thirds of the world's population of giant tortoises live among this coral formation.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

One of the oldest restaurants in the Seychelles.

A 19th-century architectural masterpiece with ties to Gustave Eiffel.

West Africa's largest fishing port honors its artisanal fishing process.

This abandoned bunker looks out over the Atlantic from its clifftop perch.

This unique religious structure is an architectural gem with arresting ocean views.

This park was designated by UNESCO as an Endangered World Heritage site.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.