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

The massive machine creates cracking displays of indoor lightning.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

Narrowest house in Boston.

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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

The Boston square dedicated to the dark poet who was born nearby.

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

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

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

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

There must be a pun in this haystack somewhere...

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

The site of a tragic massacre that spawned a multimedia franchise.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.