Visit the monolithic tomb of America's most famous general.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

One of only two commuter aerial tramways in the United States.

Try not to get slimed in Tribeca.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

The history of radiation is on safe display at the foot of a radiation science laboratory.

This museum houses an imposing skeleton army comprised of creatures great and small.

This massive library holds what was once the largest book collection in the world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This unique building in the main square stands out among the city's typically Baroque architecture.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This WWII plane died a quiet death, and is now a garden eel playground.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.