This quirky curiosity shop takes its cues from the world's bazaars.

Hear the quietest sound from across the dome.

The 10,000 Torii shrine.

An encyclopedic collection of mammal penises.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

One part local history, 99 parts gruesome haunted house.

Less a museum than a bizarre fantasy world created by artists and engineers.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A beautiful geyser under environmental threat.

A giant Troll lurks under one of Seattle's oldest bridges.

Famously misunderstood wonder of the ancient world

Medicinal spa created with the discharge from a geothermal energy plant.

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

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

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Delightful disarray of found objects and clutter.

On the Oregon coast there is a natural hole that seems to be draining the sea.

These giant metal horses graze on a hilltop near the Montana highway.

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