This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

A little sculpture with a large wardrobe.

Detailed facade of a brownstone in Boerum Hill.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

Pop culture has helped to keep this iconic British building from being destroyed.

The final resting place to 300 Victorian-era pets hides inside the city park.

A quiet memorial to those who died saving others in the heart of the City of London.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

Public access to clean drinking water was an instant hit among the masses.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

An unusual round church in London with a Templar past.

London's smallest police station is barely the size of a phone booth.

First planned industrial community in the United States.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Standing guard on top of an old, vacant ice cream shop.

The bones of an old zoo crumbling in the shadow of a new one.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

Glass and concrete building designed by Albert Kahn.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Concrete igloos standing across from what remains of the Michigan Central train depot.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

This railway-turned-greenway provides a pedestrian link in downtown Detroit and celebrates urban artwork.