This collection of Christian churches are nestled in the cracks of a rocky hill in Northern Nigeria.

Ado Awaye Mountain and the unique lake that sits near its peak are shrouded in ancient legends.

Africa's Venice on stilts.

A monument to the more than one million enslaved Africans deported from the port of Ouidah.

Dozens of snakes are housed and worshipped within the walls of this Vodun temple.

This subterranean town of over 50 dwellings lies thirty feet beneath the Earth's surface.

The unique building practices of the Batammariba reflect the community's deep reverence for and connection to the earth.

The first mosque in Ghana is known as the "Mecca of West Africa."

The world's largest church atop a political fault line.

Empty since 1989, now falling into ruin.

On an idyllic island off the coast of Sierra Leone, remnants of the defense of the slave trade and its later abolition.

A rehabilitation center for confiscated, orphaned, and abandoned chimpanzees.

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

A seaside cemetery honors the Commonwealth soldiers and sailors that died in Sierra Leone during World War I and II.

Built by Portuguese colonizers, the palace is now the seat of power for the independent nation.

This small building is a living testament to the remoteness and warmth of the town that it represents.

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

An architectural relic that survived the hands of time.

This remarkably well-preserved mosque stands amid an 11th-century caravansary.

A geological bull's-eye visible from outer space.

The second largest monolith in the world was once betrayed by its lover, Ben Aicha.

A resort destroyed by a mysterious bombing offers visitors only its remains and the riddle behind it's demise.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

The largest cave on the island of Menorca was likely the site of Iron Age rites and rituals.