This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

Take an otherworldly journey in a school dedicated to out-of-body experiences.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

The oldest surviving presidential residence in the United States.

Every October, one of the largest migration of mammals in the world thunders through Boma National Park.

These crumbling foundations are all that remain of the once-stately 1840s manor that gave the town of Bradenton its name.

World's first "penitentiary," meant to be humane, drove men insane.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Mysterious rocks that ring musically when struck.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.