The arboretum whose marshy soil sucked up the dreams of housing developers.

A six-story-tall golden pyramid, surrounded by a moat.

Prolific outsider artist Sid Boyum's concrete sculptures add whimsy to Madison's Schenk-Atwood neighborhood.

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

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

A bedazzled house and crown "jewel" of outsider artist Loy Allen Bowlin.

A museum celebrating the self-taught artist-environment builder.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

Whimsical sculptures dot a woodland path surrounding their creator's old summer cottage.

This lakefront cottage was crafted in the 1800s and was once a sanitorium.

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

This storied music venue was once a tavern that housed an Italian Anarchist book club and prohibition parties; today it's a community space for artists and musicians.

This holy goods emporium is where priests go for a little retail therapy to outfit their churches.

The first spinning jail built in the United States is the only one that still turns.

A rare labyrinth-style path carved into a historic hill.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

One man's swirling six-acre monument of stone.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

The birthplace of a titan of American cinema.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

The building was originally a gas station built to resemble a Japanese tea house.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.