Largest lake in Great Britain measured by surface area.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Handsomely crafted representations of our round planet.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This historic hotel invented the chocolate brownie.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

A private home built to resemble the shape of a microscopic creature.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Haunting and beautiful trees, doomed to die.

Venice's island of the dead.

Home to three historic ships from the age of Vikings.

This one-time health resort was used by aristocrats around the world.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.