An overlooked memorial honoring the local Washington residents who died in World War I.

The rogue roots are gradually consuming some of the historic marble grave markers.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

Baroque celebration of the end of the Great Plague of Vienna.

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

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A miniature train-ride through Slovenia's largest cave system.

A whimsical bridge adorned with decorative dragons.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

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

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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