The oldest continuously occupied public building in the United States.

A natural formation that resembles a camel resting in the New Mexico desert.

This high desert botanical garden is a unique display of Northern New Mexico's geology.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

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

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Museum about life, death, and cannibalism in the Stone Age.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Famously misunderstood wonder of the ancient world

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The secret city built by the Manhattan Project.

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

Largest man-made excavation on earth!

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

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

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

A beautiful geyser under environmental threat.