These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This post-war motel embodies a little-known, Miami-born architectural style.

The bizarre story of the mysterious death and hidden treasure of one of Sanibel Island's early homesteaders.

The solitary cairn marks a mysterious death that's still controversial more than two decades later.

From here, the loch appears to take the shape of mainland Scotland.

This work of engineering is imbued with elegance and ingeniousness.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

In September 1974, a small group of athletes completed the first modern triathlon event in San Diego's Mission Bay.

The first monument in Estonia that was made by an Estonian sculptor.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

On the side of a building, a depiction of the woman who became a local legend by tossing soup out her window.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

A unique art installation located on what was once considered the widest railway bridge in the world.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The final resting place of the famed German pilot, the "Red Baron."

This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

The site where two doves fell in love.

This medieval footbridge in the Swiss Alps is known to attract cliff-jumping daredevils.

Dedicated to the untimely death of American balloonist and parachutist.

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