Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

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

An experimental, automotive replica of Stonehenge.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

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

Commemorating the spot where the famous scientist fed his pigeons.

The former hotel where Tesla invented the radio.

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

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Go take a picture with the inventor of the daguerreotype photographic process.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

First planned industrial community in the United States.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.