An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Experience the pivotal Civil War battle at this interactive museum.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

An abandoned church gets a second life as a massive beer hall and event space.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

A pair of 19th-century granite markers symbolically record where the state boundaries of New York, New Jersey, and Pennsylvania intersect.

Dim sum, served in a grand old theater.

This hidden labyrinth offers walkers some brief peace of mind.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.

A perfectly crafted Pre-Columbian artifact dating back to 600 CE.

This impressive Boston holy house is the American mecca for Christian scientists.

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

A 17th-century Japanese bell brought back by U.S. sailors after WWII and later gifted as a symbol of peace.

An enormous, inside-out glass globe built in 1935.

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

Statue commemorating the use of ether in anesthesia.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

A men’s restroom became a sandwich shop.

This steep slide at a kids’ playground went viral after an police officer tumbled down it.

The colonial home of Paul Revere during the American Revolution.