A plaque outside the San Jose airport commemorates the insect's arrival to the West Coast.

The oldest house in the capital of Silicon Valley.

It is locally loved and ridiculed for literally looking like poop.

Three plaques mark the spot where the "forgotten father of broadcasting" worked.

The topiary maze at the Habsburg hunting lodge.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

An alley covered with 20 years of bubble gum.

A deserted hodgepodge of experimental structures designed by nearby university students.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Hear the quietest sound from across the dome.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Macabre astrological automaton clock dating to the late 1400s.

This natural marble cave is one of only five national monuments in Oregon.