A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Elevated freight railway turned wildly successful urban park.

A layered tribute to the work of mosaicist Isaiah Zagar.

An artist's cute bronze subway sculptures belie his violent artistic past.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A terrific purveyor of natural history objects and curios.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A downtown park built on top of unclaimed graves.

Two stunning 17th-century libraries and a cabinet of curiosities.

Trash escaped from a landfill to fill beaches with all kinds of treasure.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

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

Detroit housing collective working to create an "environment for revolutionary change."

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

Enormous small-business mecca in the Midwest, serving dozens of artists.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.