Ming Dynasty necropolis raided during the Cultural Revolution.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

An emerald-green grotto just a short trip from Austin.

A popular swimming hole that hides one of America's most deadly diving spots.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

An ancient neolithic tomb that only sees the sun twice a year.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

The ancient tomb acts as a calendar that keeps perfect time.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The oldest public library in Ireland.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

There’s a special club house at the top for the bell ringers.

The highest point in Belgium is a staircase to nowhere.

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

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.