At least seven hues of blue and turquoise make this freshwater lagoon unique.

This immense scene of a cosmic battle between a jaguar and serpent illustrates the Aztec concept of the duality of life.

It's believed this golden brick is part of the legendary lost Aztec treasure.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

Colombia's biggest botanical garden contains plants from all across the country.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This site honors the end of a 100-year boundary dispute between the United States and Mexico—all started by a river's shifting course.

The boulder is a landmark, public art, and an icon.

The remains of the oldest bone-headed dinosaur in North America.

Canada's largest dinosaur skeleton was hidden away in storage for more than 40 years.

A fitting attraction for the corn capital of the world.

This bridge was constructed from the rubble of the infamous Bastille.

The pockmarks across the building's facade are remnants of the Blitz.

At almost 1,000 years old, this is the oldest known door in all of Britain.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A mysterious shape catches the eye in this 16th-century painting.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A hot dog stand where the heads are just as hot as the dogs.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

One of the finest examples of a black soil prairie that was barely saved by the Great Depression.