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

A Jenga-style cylindrical tower of books that appears to go on forever.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

New York City's only radical feminist independent bookstore.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A room in New York City that contains 250 cubic yards of dirt.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The “American Gothic" artist's largest works hang in an Iowa State University library.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

An experimental, automotive replica of Stonehenge.

This erect, phallic geological spire wasn't always named so domestically.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This South London cemetery holds the remains of more than 15,000 people.

An underground city of salt.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

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

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.