A hip bar decorated with walls of golden skulls.

The "Seinfeld" diner.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

Elevated freight railway turned wildly successful urban park.

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

New York's oldest magic store.

Try not to get slimed in Tribeca.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Toxic waste disaster that founded the Superfund program.

Western New York's largest independent bookstore doubles as a historical repository of all things Niagara Falls.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This small, but long-running hobby club has built one of the largest model rail lines in the US.

Beloved bar home to musicians of all eras and reputations.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

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

These gardens recreate unique and endangered Michigan habitats.

Trade in that pesky human soul for cold-hard circuits.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Easily overlooked in favor of the wineries that dot the region, this blast from the past is equally worth the visit.

A comedy troupe's collection of bizarre humor.

The site where Michigan launched its first rocket into space lies abandoned in the dense woods along Lake Superior.