This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

The zoological collection at the Hessisches Landesmuseum hosts some of the world's oldest habitat dioramas.

A German apartment building hosting as many trees as human occupants.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

The water here is so clear you can see the mysteriously sunken ship from the surface.

For nearly 2,000 years this church has been waging war on local snakes by importing cats.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.

These ruins disappear beneath the waves every winter.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

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

Where condemned pirates met their grisly end at the gallows on the River Thames.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

The broken skateboards that became a poignant memorial to a murdered skater.

This ancient Egyptian obelisk still bears the wounds of World War I.

An architectural oddity hides in plain sight on this iconic London bridge.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

Scattered throughout London are ancient remnants of the city's former bounding wall.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.