A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.