These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Catacombs turned marketplace.

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

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A bit of retro transportation flair preserved in the world's largest department store.

Elevated freight railway turned wildly successful urban park.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

Lie in a hammock where George Washington stood.

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The home, museum, and death site of Kodak's influential founder.

The massive machine creates cracking displays of indoor lightning.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A bronze tribute to the wildly popular video game from the '90s.