A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

A lavender labyrinth so large it’s visible on Google Earth.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

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

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

This freshwater spring fills with 10,000 gallons of water per minute.

Abandoned concert venue legendary for its rock counterculture.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

A massive rotating globe sits at the center of Babson Park.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

Mural fragments and various sculptures honor the longtime artist.

Once the largest gravity dam in the world.

One man built this massive wall to keep his neighbor from complaining about working on Sundays.

A historic bridge no one is allowed to cross.

The sea urchin sculpture is an unusual commemoration of a New England town's seafaring history.

Hill-like structures formed by glaciers and sandy spits of land.

This art display in Dedham honors a local fish, and is dedicated to the volunteers who restored the canal.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

Hundreds of personalized inscribed planks make up this historic boardwalk.

A short walk through the woods will take you to an unusual flat hill top, used by the Shakers for outdoor worship.

This exhibit is devoted to the games and wonder that Hasbro has brought children worldwide.