A perilous medieval road leading right into the sea.

The last resting place of the famous Native American princess is marked by a haunting monument.

One of the oldest cathedrals in the U.K. houses a priceless early manuscript.

A pair of connected skyscrapers form this symbolic gateway.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

This fortified town dating back to the 1400s is often described as an open-air museum and is a protected National Monument of Bosnia and Herzegovina.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Eliza and Mary Chulkhurst were the first famous conjoined twins in England, but it's not clear when they were born.

The first archaeological site discovered by aerial photography.

Famously misunderstood wonder of the ancient world

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Legend says this sacred tree was a gift from goddess Athena.

Gladiators once walked this ancient, subterranean passage.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

This 135-year-old weather station studied the effects of the climate on human health.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This unassuming sculpture depicts grandfather of science fiction Jules Verne and his brother as children.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

This longship was a gift to commemorate the 1500th anniversary of the Anglo-Saxons arrival in England.

The "Heroine of Dunkirk" rescued over 7,000 Allied troops during the historic World War II evacuation.