This artificial lake surrounded by Brutalist architecture served as a stand-in for futuristic Britain in Stanley Kubrick's 'A Clockwork Orange.'

The world’s second-largest flood defense barrier has protected London for decades.

This sculpture of a pylon is upside down and askew, as if its main purpose is to confuse passersby.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

Legend has it this gnarled old tree was planted by Tsar Peter the Great during his visit to London.

The remains of a historic football stadium that once hosted 50,000 spectators.

For more than half a century, an enormous feline has watched over this London neighborhood.

A much-loved local landmark pays tribute to the shipbuilding past of this area.

A stone, covered in metal, commemorating an event that happened somewhere else a thousand years ago.

This unlikely memorial honors the Canadian and Portuguese laborers who felled trees for the Allies in World War I.

This Greek Orthodox church houses the mummified body of St. Spyridon.

A spectacular Neoclassical palace is home more than 15,000 artifacts and works of art.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The first "applecore" style lighthouse in Nova Scotia.

This colorful mosaic remembers one of Britain's most deadly peacetime fires.

An angelic, yet demonic-looking figurine presides over one of Glasgow's most ancient streets.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The Guinness Record holder as the "tallest cinema in the world" is a building with screens in almost every one of its 12 floors

This neon sign is an homage to an Alfred Hitchcock film.