All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

The Great Fire of London and the regulation of one-way streets both started in this alley.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

The commemorative stone column conceals a secret laboratory.

Flying high over the small island of Zákynthos is a giant tribute to the mainland.

A bay of elaborate, historic toilets are held in high esteem at this Scottish dock.

This beach runway is off limits during high tide.

Despite the name, this ancient piece of crystal may not have been a lens at all.

This pub boasts a curious history and may have inspired a Dickens character.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

Hundreds of signs pointing to the birthplaces of current Helsinki residents form stalactites on the ceiling of the cave-like Kamppi metro station.

The door to the museum holds a unique artifact from the Finnish Civil War.

This church also serves as a lighthouse complete with a beacon.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.