Giant, friendly pelicans in Central London, the most unlikely of places.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Gang fights don't just happen on the streets, they happen under them too.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.

As telephones become more essential and less stylish one historic Brooklyn building remembers the days when they were a grand celebration of communication.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Storage warehouse of the rich and famous.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

A sculptural commentary on capitalism pokes up from the East River.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

This 220-year-old house is a reminder of New York City's Dutch past.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

A terrific purveyor of natural history objects and curios.

The former sign of this immortal music venue is just that--undying.