The oldest stone house in Paris was built by its most famous alchemist.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A hands-off space for graffiti artists to hone and display their skills.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

The most loyal of little dogs, or a Victorian era publicity stunt?

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

This massive work of art was designed to commemorate Burns Night and the national poet of Scotland.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

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

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

This early version of the guillotine was used to execute the man responsible for its construction.

A sweet symbol marks the place where torturous executions were once carried out.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Protecting the dead from opportunistic body snatchers.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

This sandstone mansion was the home of two of Oregon's most important pioneers.

10,000 flowered plants bloom in the City of Roses.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

A tiny town in an empty lot was the work of a local eight-year-old.

A unique columnar residence built in the 19th century.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.