A miniature rainforest is growing inside of a Midtown Manhattan office building.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

Eliot was the first missionary to produce religious text for Algonquians in their own language.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

Once the largest public hospital for the mentally ill was also surrounded by controversy.

No one really knows how these old hobby horses got here, but the herd keeps growing.

This castle constructed in 1928 was crafted from drawings of Lismore Castle in Ireland.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

The walls of the iconic dome are hollow and have a secret stairway.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A unique columnar residence built in the 19th century.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

One of America's most historic homes also holds a startling literary legacy.

Beautiful steampunk ghosts of early Massachusetts.

The macabre paintings created by famous suicide proponent Jack Kevorkian, or "Dr. Death."

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

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.

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

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

An elaborate, hidden model train in the Needham Town Forest.

One of the largest public collection of historic armored and military vehicles in North America.