Golden Gate Park's historic collection of plants.

A winding path built in secret on the edge of the continent.

A domino effect created with Britain’s iconic telephone boxes.

A century and a half of research in the sciences and natural history, still going strong.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A unique market that brings together various goods and cultures.

Catacombs turned marketplace.

The taxidermied remains of a once-great parrot.

One part local history, 99 parts gruesome haunted house.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The ritual has been performed uninterrupted for nearly 700 years.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

A fantastic Christmas tradition where defecation meets the manger.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Eat a tasty meal in the house where John Steinbeck was born.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An overlooked memorial honoring the local Washington residents who died in World War I.