Turnip-shaped island just off the Michigan shore in Lake Huron.

Take a drunken tour inside the world's largest known geode.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Vikings and Evangelicals have both had a hand in this replica medieval church.

The center of the only hemisphere that awards visitors with a commemorative coin.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.

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

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

A medical facility that has been kept frozen in time.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

Display that gathers the basic elements of the universe in one convenient location.

A wartime promise becomes a shrine to Our Lady of Lourdes.

A mysteriously dark cemetery monument fuels stories and legends galore.

House built with over 60,000 glass bottles.

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

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.

A lovely hidden waterfall right off the highway is well worth a stop.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

Once known as the Illinois Asylum for the Incurable Insane.

Paranormal activity on the great lakes.

A 30-foot man on a penny-farthing bicycle rides along the banks of the Mississippi.