Amsterdam's Red Light District leaves little to the imagination.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

The history and future of cannabis.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

Writers such as Paul Bowles, William Burroughs, and Samuel Beckett frequented this Tangier bookstore.

A sign marks where the two bodies of water meet.

On the outside of the Mersey Tunnels, an Art Deco sculpture of an Egyptian Pharaoh wears goggles and racing gear.

This aging storage facility is the world's largest brick warehouse.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

This bronze statue was dedicated to a 1966 Beatles hit.

The tower was originally used as a chimney for the waste incinerator of St Johns Precinct and Market.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

19th century tunnels burrowed under Liverpool.

Once thought to be a decorated air shaft, it might just be a castle-shaped folly.

The longest cutting on the M62 contains some surprises—though it's best to leave the motorway to appreciate them.