Catacombs turned marketplace.

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

Eighty million natural history specimens call this gargantuan museum home.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A Museum Dedicated to the Heroes That Fight Fire.

A Building for Your (Former) Funerary Needs.

This former industrial site has transformed into a community sculpture garden that hosts monthly Full Moon parties.

With over 5,000 champions, the Hall of Fame continues to draw amateur eaters.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

World's largest Christmas store.

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

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

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

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

A 18th century graveyard and its astonishing cortege of macabre iconography.

360° views of the city plus five floors of optical illusions and hands-on science.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.