The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A massive volcanic plug is now a protected area that hosts a number of bird species.

It's not your typical library, memorial, or book store.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A toweringly silly piece of modern art has been delighting locals since the 1980s.

When flour explodes, it's not a pretty sight.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This simple apartment may have inspired some of the most important theories in the history of science.

Houses are tucked between, on, and underneath giant boulders.

Hear the quietest sound from across the dome.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

Giant marble phalluses on the sacred island of antiquity.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

A little sculpture with a large wardrobe.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The celebrated eyesore created by starry-eyed sweethearts.

2300-year-old Roman road connecting the empire.

A three-story, three-dimensional hobo clown in a tutu welcomes CVS shoppers.

Authentic gondola hanging from the ceiling, notable mural in the back room.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.