A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

Home to more than 13,000 pieces of war memorabilia and military equipment.

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

The seat of the lost Ryukyu Kingdom has survived numerous fires and wars over the centuries.

This neoclassic cathedral also houses what is believed to be the oldest clock in the Americas.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The last bastion of Roman presence north of the Alps looms over a German town.

The celebrated eyesore created by starry-eyed sweethearts.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The most loyal of little dogs, or a Victorian era publicity stunt?

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Three columns of volcanic rock shoot out of the ocean.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.