The largest greenhouse in the world is home to over one million types of plants.

A fantastic castle rumored to be the birthplace of King Arthur.

The world's largest collection of witchcraft regalia.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This natural wonder is disappearing at an alarming rate.

Canada’s surprisingly controversial monument to Dwight Eisenhower.

The granite head appears to be deep in thought and half buried in the ground.

These pretty kitties killed and ate as many as 135 railway workers.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Cat art as far as the eye can see.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

An incarceration museum on the spot of possibly the oldest prison in England.

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

The curios of pharmacist and collector Henry Wellcome.

A hands-off space for graffiti artists to hone and display their skills.

One part local history, 99 parts gruesome haunted house.

A naturally mummified 2,000-year-old man.

Giant, friendly pelicans in Central London, the most unlikely of places.

Fossils, railroads, and waterfalls!

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.