These trenches were used to train the Scottish military for life on the frontlines of World War I.

Dozens of large, brightly-colored paintings adorn the walls of the "street art capital of Iceland."

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

Described as one of the Baltic region’s most daring and original construction projects.

This medieval "painted village" is famous for its geometric facades.

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

This "railway" for boats continues a waterway over a road.

The widest natural waterfall in Estonia is a sight to see in all seasons.

A unique Soviet mosaic preserved on the facade of a shoe factory in Lviv.

This fortress was designed to prevent a Nazi invasion but was never used.

An abandoned cable car station located on the Danube stands like a haunted house above the river.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

A unique museum where guests can rent and operate a locomotive.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

The Okefenokee Swamp houses this "incredibobble" tribute to the creator of America’s favorite cartoon possum.

Visitors can sit and study the board with this Estonian chess legend and International Grandmaster.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.