This might just be the TARDIS of bookstores.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

Beautiful steampunk ghosts of early Massachusetts.

This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

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."

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

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

Painstakingly built dioramas sit unnoticed in a Boston office building.

Statue commemorating the use of ether in anesthesia.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

Dim sum, served in a grand old theater.

This historic Boston building has gone from personal estate to porn theater and back again.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

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

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

"Mock all and sundry things, but leave the saints alone."

The infamous Boston Mob ran rackets from an office here in the 1970s.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.