Geothermal waterfalls in Tuscany.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A painfully obvious spy house sits right across the street from the Russian Embassy.

The United States Capitol's former columns still stand.

A historic neighborhood church is reborn as a psychedelic arts collective.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

The final resting place of England's most notorious bandit.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

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

A complicated contraption for telling time by the moon.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

The remains of an ancient bathhouse sit inside this aptly-named pub.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Don't be fooled by this fake medieval facade even if it is almost 300 years old.

Eighteenth-century home, where Herschel discovered the planet Uranus.