Macabre astrological automaton clock dating to the late 1400s.

This no man's land slicing through the island is strewn with abandoned relics of another time.

A striking symbol of the Bulgarian capital.

Bridge that died in war and was resurected.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

In Egypt's expanding metro area, many of the neighbors are dead.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Op-art architecture designed for happiness.

The final resting place for the remains of 143 Habsburg royalty.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

This group of sculptures includes the first statue of a female politician in London.

The remains of the debtor’s prison that shaped Charles Dickens’ life and writing.

How did a fuel storage container become one of the most famous sights in the sporting world of cricket?

The bust of a 15th-century Albanian leader in the middle of London.

The first regular high-definition TV transmissions were made from this seemingly out-of-place mast located on one corner of a Victorian-era entertainment venue.

These 19th-century gas tanks were remade into an apartment complex.

The extra platform at Gloucester Road has been used for art displays for over 25 years.

As seen in the Spice Girls ‘Wannabe’ music video.

A statue honoring a preeminent 19th-century dandy and important figure of men’s fashion.

This elaborate banquet hall in Queen Victoria's summer residence is an homage to Indian architecture, including miniature models of palaces in India.

These former ticket office windows in London's underground now house pocket-size parks.