The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

An abused and forgotten metropolis, abandoned for centuries.

Because sometimes the most efficient route from A to B isn't a straight line.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

An enormous concrete structure built over a nuclear crater.

This beautifully deceptive waterfall is something far different from what it appears to be.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

Giant sand sculptures of famous people and places are on display near the Tottori sand dunes.

An architect transformed this abandoned cement factory into his castle-like workshop.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

A perilous medieval road leading right into the sea.

A Himalayan monastery claims to have a piece of a centuries-old abominable snowman.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

Trace the history of writing at this unusual North Carolina destination.

The Arctic Circle runs through this isolated spot north of Iceland.