A hip bar decorated with walls of golden skulls.

New York City's smallest piece of private property.

A terrific purveyor of natural history objects and curios.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

The notorious headquarters of a corrupt political machine.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

An artist's mausoleum with a haunting echo.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

A church of bones, decorated with 40,000 human skeletons.

Two stunning 17th-century libraries and a cabinet of curiosities.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

The Atlantis of Cape Cod reemerges during the lowest of tides.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

World's largest cave was only discovered in 1991, and now offers tours to the public.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

This innocent-looking townhome is actually a subway exit.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A curious friendship between two inanimate ladies.

A trash dump made beautiful by nature's power.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Human ancestor’s 3.6 million year-old footprints.

Most-visited and most-photographed slot canyon in the American Southwest.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A Saint Nicholas-themed ghost town in the Mojave desert.