Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Eat the ultimate iteration of Portugal's most beloved pastry.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The headquarters in Salem doubles as an occult art gallery.

A collection of full-size movie monsters opened to the public.

A luxury hotel constructed out of a former jail.

These items are all that remain from the room used by the author during his second tour of the U.S.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

This landmark cemetery in Boston was created more than 300 years ago.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This 35-foot-tall hamburger-toting chef is said to be the largest bobblehead in the world.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

A former Canadian automobile ferry mysteriously appeared in the Black River 20 years ago, and now it quietly rusts away.

Resting place of Hollywood's immortals is also site of summer film screenings.