Elaborate tile work in this railway station tells the story of Portugal.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A 12th century church completely covered in shells.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

Cemetery honors Americans who died during WWII and is the resting place of Gen. George S. Patton.

The only castle in North America to ever house European sovereigns.

The world's longest continuously running show has played at this small West End theater since 1974.

The medieval woodcut-style artwork chronicles life in medieval London.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Hear the quietest sound from across the dome.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.