A riverside tiny house with books and other treasures galore.

In Rickwood Caverns, visitors can travel hundreds of feet underground and see beautiful formations unique to the region.

Once considered one of the country's finest motte and bailey castles.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

This hidden treasure provides a charming access point along the south side of Baker Park.

The roofless ruins of a church surrounded by acres of bucolic farmland.

The church and nearby castle are all that remains of a medieval village, mysteriously abandoned.

The first outlet of Canada's biggest fast-food franchise has been slinging doughnuts since 1964.

Glasgow's oldest pub has a proud literary tradition and possibly a ghost or two.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

This series of Scottish caves has no clear purpose other than baffling historians.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

A river with some unusual, and occasionally dangerous, habits.

The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.

Canada's largest dinosaur skeleton was hidden away in storage for more than 40 years.

This ornate Weser Renaissance house was also the home of an infamous witch hunter.

A spitting ode to a German serial killer.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.

This ghost-town bar has bullet holes and plenty of stories lurking within its walls.