A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

A psychedelic labyrinth on the San Francisco bay.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A 140-year-old castle with underground caves hidden in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge resale shop for the cast-offs of the film & television industry.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

Now the site of a high school, this was almost the location of the largest cathedral in the US.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

An unconventional space for art and science housed in a massive old warehouse.

A hidden architectural treasure in New York's Brooklyn.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

A no-frills cinephile haven known for showing offbeat, underseen films.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

19th century cemetery hidden in Brooklyn's Prospect Park.

A curious friendship between two inanimate ladies.