A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

London's first edible insect farm offers facility tours and cooking classes.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.