Strange physical sensations and optical contradictions keep visitors coming back for more.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

An optical illusion found amid a logged redwood forest.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Cars mysteriously roll uphill on this street.

An optical Illusion once believed to be an electrical phenomenon.

A haunted hill that supposedly defied gravity.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

A mysterious spot where the laws of gravity seem not to apply.

Things roll uphill on this Mexican street that seems to defy gravity.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The only land territory disputed between the U.S. and Canada.

A long-disputed island that Denmark and Canada claim by periodically alternating flags and bottles of liquor.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

The largest piece of no man's land left on Earth.

A small part of Russia that does not touch any other part of Russia.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

A small granite monument marks where the borders of three countries meet.

It was once nicknamed "the most bombed hotel in Europe."

The easternmost town in Alaska can only be accessed from Canada.

America's silhouette includes 100 square miles of wilderness jutting into Canada thanks to an old mapmaking error.