This New England drive-in was built to straddle the border between two states.

A beautiful maze marks where three countries meet.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

This marker identifies the location where three states converge.

This small piece of Michigan is entirely surrounded by Ohio.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

Now in disrepair, this 19th century station was a stop on of the famed B&O Railroad.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

An art deco ice cream shop covered in vintage train station tiles.

What is it about mushrooms that makes people wish they lived inside of them?

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

This historic railway museum may have lost its passengers but not its love for trains.

A jewel of early electric boosterism once again charms Connecticut's historic "Hat City."

This old cement mine has been used as everything from a mushroom farm to a recording studio.

A world-class observatory in the California desert.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

This last stalwart of the now-forgotten feminist restaurant movement has been serving food in an activist atmosphere since 1977.

Connecticut's shot tower is near the end of its life.

The first pet cemetery in the United States.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.