Home to the deepest rift anywhere on Earth.

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.

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

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

A smoke stack so large, the Washington Monument could fit inside!

This playground sculpture of an icon from the past is dedicated to the children of the future.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The magic's in the hole!

10,000 flowered plants bloom in the City of Roses.

A collection of colorful dinosaurs hidden in an actual rainforest.

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

There's something big lurking beneath the surface of this tiny Oregon park.

A high-octane shrine to the greatest Texans who ever lived.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

On the Hudson resides one of the largest clocks in the world.

New York's southernmost subway station is whimsically wavy.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.