This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This amazing piece of modern art honors the hundreds of fishermen killed during Cambrils' "year of misfortunes."

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

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

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

A harrowing sculpture commemorates the four people shot down during the workers strike of 1842.

This stack of stones honors a murdered 18th-century woman.

A living memorial to the trees London lost during the Great Storm of 1987.

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

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A complicated contraption for telling time by the moon.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Stonehenge has nothing on Castlerigg’s views.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This 16th-century house tells the city's history through old artifacts and quirky tales.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A measuring mishap led to these artificial stone ladies losing their stomachs.

A little slice of Japan and its aesthetics in London's Holland Park.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.