A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

A library and museum dedicated to typography.

A notorious punk house turned co-op.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An art deco ice cream shop covered in vintage train station tiles.

Where beautiful signs live on forever.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

New York's oldest and possibly grandest keeper of books.

A staggering collection of photographs depicting medical, social, and historical change.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

The notorious headquarters of a corrupt political machine.

A prohibition era watering hole for the police.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Hear the tales of New York's most notorious criminals.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A bright little alley in La Boca is a part of tango history.