A luxuriant botanical garden below sea level.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

This unique zoo is the only place in the world where you can see all 15 species of crane.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Less a museum than a bizarre fantasy world created by artists and engineers.

This was once the largest four-sided clock in the world (yes, even bigger than Big Ben).

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A unique botanical garden housed in three giant geodesic domes.

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.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

This replica of the Greek structure is in the heart of Nashville.

A curiosity-seeker's paradise set inside a three-story historic school house.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

In Indiana's first capital city of Corydon, the original State Capitol still stands among other historic buildings.

A former limestone quarry has found a new life as a flourishing community garden.

Marine fossils from the Devonian period are exposed at this park.

A set of tall pillars and alcove-like rooms that are significant to the Miami people of Indiana.