The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The majority of the highest mountain in Poland is actually located in a different country.

An underground city of salt.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

A fountain standing as a testament to a doomed alliance.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This replica of the Greek structure is in the heart of Nashville.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The 10,000 Torii shrine.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

When ecosystems collide in the arid Southwest.

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

The magic's in the hole!

A Bibliophile's Dream.