This small collection of rare books was uniquely locked up for safe keeping.

A mysterious artist-run cabinet of curiosities and library.

Volunteer-run library dedicated to exploring five decades of activism history.

A beautiful but toxic fountain of mercury.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This long-distance walking route follows the Prime Meridian line as it passes through England.

New York City's first Modernist house.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

One of Frank Lloyd Wright's final works was this UFO church.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

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

The oldest house in Chicago certainly doesn't look the part and there are some who say it doesn't deserve its title either.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A hot dog stand where the heads are just as hot as the dogs.

An avant garde art museum at the University of Chicago.

A display of magnificent stained glass windows is the first exhibit of its kind.

First planned industrial community in the United States.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.