This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Prehistoric animals decorate this popular outdoor park.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

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

Pizza with a side of fine art.

A Museum of Holography frozen in 1974.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

These abandoned grain silos and tunnels are an urban exploration dream.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A monument to the art of slicing people open.

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

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A lush green oasis in the middle of Chicago.

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

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

Once America's tallest structure, now a Baltimore landmark.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

A stack of stones steeped in Irish folklore, much like the hero they're connected to, hide in plain sight.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.

A whimsical folk art environment where you can lose yourself in the many colors of joy, beauty, and creativity.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.