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

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

Step inside Lucy, the world's largest "elephant."

Yo, Adrian!

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This elaborate towering structure was once famed for its revolutionary height.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

An exotic wildlife habitat right off The Strip.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

The 28-foot granite map plots the locations of 40 theaters in New York City.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The world's oldest surviving music hall was also once a freakshow.

This stately estate house features a tower covered in a bright, modern mural.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.