The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Reverend Franzo Wayne King administers spiritual enlightenment through the music of the jazz legend.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

The R&B singer's modest church guarantees a religious experience, regardless of your beliefs.

A chessmaster's dream destination.

A big museum full of little worlds.

An urban forest overtakes what was the greatest failure of utopic urban housing.

Live long and prosper in Tennessee.

This structure among the trees was the result of divine inspiration.

A retired tobacco farmer's pet project turned into a sturdy miniature city.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

This little museum in the town where zombies were born celebrates the living dead.

An abandoned stretch of highway, deteriorating next to the operational one.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.