This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

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

Rusty red sands line the shores of this Canadian Province.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

A former zoo turned public park, where visitors can hang out in the old animal cages.

The world's largest rotating world.

A very classy 1920s-era bar right in Grand Central Station.

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

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

The notorious headquarters of a corrupt political machine.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

A little sculpture with a large wardrobe.

Catacombs turned marketplace.

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

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

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

The remains of the great moral philosopher reside in a university in London.

One part local history, 99 parts gruesome haunted house.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.