Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A science teacher's dream.

An antiquated German apothecary on Chicago's North Side.

The subtle science of a master molecular gastronomist.

A European-style bath house in Chicago.

Illegal drag racing two stories beneath Chicago’s streets.

Orthodox church partially financed by Tsar Nicolas II.

A bloodstain from "the wound of the transverberation of the heart."

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

This historic hotel invented the chocolate brownie.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

A monument to the art of slicing people open.

This shop for all your super spy needs hides an educational secret.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.