A centuries-old church stands as a testament to Boston's "father of architecture."

Historic Hull Street was actually the first street with a proper name in the Boston area.

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

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

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

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Ancient snack bar of the Roman Empire re-opened.

The glowing blue Nymphaeum of Emperor Tiberius.

This clifftop arch is a natural stunner.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.