The castle still holds traces of the abandoned Roman fort it was built atop.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The location of the world's first telescope demonstration.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

A public urinal so pretty, it was declared a national monument.

Christ's blood allegedly preserved in a Belgian town.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The celebrated eyesore created by starry-eyed sweethearts.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The most playful of the life-sized statues that make up Singapore's "People of the River."

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

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

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.