There’s a special club house at the top for the bell ringers.

Largest Roman Catholic church in North America.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Outsider art meets paleontology at this roadside reptile repository.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

"I did this all while you were watching TV."

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

Home of the International Space Hall of Fame.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

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

A museum dedicated to the alleged Roswell Incident.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.