This bridge was the birthplace of a unit of measurement based on a fraternity joke.

An enormous, inside-out glass globe built in 1935.

A men’s restroom became a sandwich shop.

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

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Go inside to really appreciate this 500-year-old technological masterpiece.

The mummified relic of St. Antoninus.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Scattered throughout London are ancient remnants of the city's former bounding wall.

An unusual round church in London with a Templar past.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

A massive sustainable farm designed by the mastermind behind Central Park.