A giant concrete Brutalist water tower in suburban Johannesburg.

The stunning interior of this Gothic church is covered in ornate gold details.

Elaborate tile work in this railway station tells the story of Portugal.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

One woman's Viking Castle on Lake Tahoe.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

This amateur-built East African church with mismatched towers is an architectural abnormality.

There is only one place in the world where the corners of four nations come together.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Sculpture park built by a 50-year-old widow.

Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.

Taxidermy of a famous hippo who spent three years walking over a thousand miles across South Africa.

Khmer Rouge's high security prison.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

An extravagant monument to an extravagantly unpopular Emperor.