These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

Dr Barnes' $25 billion private collection of art and arboretum.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

An original apothecary from 1792.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

The trials and tribulations of marking Poe's grave.

A former major munitions plant that has been converted into a sprawling art space.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

At 207 feet, one of the world's longest continuous escalators.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

A singular collection of hand-built art deco cars are held in a building with style to match.

A Roman-style column in Oregon hides a spiral staircase inside.

A massive sea stack famous for its appearance in The Goonies.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

Home of Howard Hughes' Spruce Goose.

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.

One of the world's tallest, oldest, and most disgusting chocolate cascades.

A heavenly experience, right here on Terra Firma.