A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

This mysterious hill seems to pull objects uphill.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

A medical facility that has been kept frozen in time.

Rare recess caves fill this unbelievably beautiful Ohio park.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

This magnificent Cincinnati graveyard is also a popular public park.

An unassuming 13-acre park is home to over 12,000 roses.

A county library in rural Ohio houses one of the finest mineral collections in the world.

The largest ancient burial mound in Ohio.

This moving cemetery sphere is a slowly rolling stone.

A tourist attraction founded around a slumping cabin.

A midcentury ranch house hides a literal treasure trove of unique rocks and minerals.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

Tour the sci-fi-esque reality of governmental disease management.

World's only nuclear reactor operated by liberal arts undergraduates.

The sign at the garden gate reads: "These Plants Can Kill."

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

A garden of flying flowers.