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

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

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

A Roman spa buried deep beneath the City of London.

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

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

The bronze uniforms commemorate the vital role of women during World War II.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

A famous burial ground with a history both grim and literary.

Visit on a Sunday morning to see some killer tricks.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's newly reopened hands-on science museum.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A petite castle folly in the English countryside.

A open air theatre built on a cliff by an eccentric British woman.

Largest lake in Great Britain measured by surface area.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.