At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

The reconstruction of this prominent building fulfilled a long-written command.

A graveyard that dates back over 200 years stands near a busy shopping center.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This remarkable parking garage in Darmstadt has lived several lives and still contains remnants of its World War I past.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

The last remaining pre-dreadnought battleship in the world has been a museum for nearly a century.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

This statue has a painful history, but activists have since recontextualized it as a way to educate visitors about the dangers posed by fascist regimes.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

These unique markers designate the route American forces took during the Liberation of France.