The largest Jewish museum in the southeastern U.S. houses a permanent Holocaust exhibit emphasizing the strength of its survivors.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

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

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

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

A lush green oasis in the middle of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

As its grandiose name implies, this wooden dome is unsurpassed in size.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

This cave holds a surprisingly colorful variety of geological oddities.

More than 5,000 contemporary and "historic" mustards from around the world.

This freshwater spring fills with 10,000 gallons of water per minute.

Egyptian Revival obelisks still rise over the old mine shafts.

Almost half-way between the Equator and North Pole.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

An unlikely beach paradise of giant sand dunes lies between two lakes just a few minutes from Michigan's cherry country.

The park is home to the United States's only still-operating Dutch windmill.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.