An iconic location along the Los Angeles River where countless movie scenes are filmed.

A Bicycle Path in the Sky.

Secret US military film studio in the Hollywood Hills.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

America's most famous piece of self-built architecture.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

An academy where anyone can train in the exciting acrobatic sports of parkour and freerunning.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Surreal riveted sea forts once protected the Kent shores from German attack.

Cryptic messages embedded in the New York City sidewalk.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Unlock the secrets of the conjuring arts.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

A dilapidated dock tells the story of Titanic's missed arrival.