Dim sum, served in a grand old theater.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

This grubby wall is said to be one of the Earth's esoteric energy centers.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

This 13th century Gothic brick castle is the largest in the world by surface area.

One of the world's largest collections of medieval religious art.

A memorial to the beloved brown bear that served in the Polish army during World War II.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

This imposing 20th-century castle was abandoned before it was ever completed.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

A 20th-century picture show in 3-D.

Naturally formed rock city in Poland.

This man-made mound monument was built out of soil from all across the Polish empire.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

A hidden art gallery in an abandoned Warsaw fort.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.