This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

After 800 years, Europe's oldest elm tree has met its end.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

The location of this historic castle was inspired by a donkey.

A pagan tradition of draping trees with rags eerily lives on.

This lovely Scottish nature walk leads to the source of a local legend.

This state park was once an important Native American cermonial center.

This sidewalk monument honors more than 50 civil rights activists who helped change the face of America.

World's largest magnetic research facility.

An unusual college football tradition involves burying pieces of sod from competitors' turf, replete with tiny coffins and headstones.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

A trek through the solar system here on earth.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

Where manatees are the snowbird vacationers in these balmy Florida springs.

View rare birds and interact with lemurs at this nonprofit run entirely by volunteers.

This abandoned bridge is now a favorite haunt for graffiti artists.

The so-called "world's shortest river" is actually a window into a cave.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

An emerald-green grotto just a short trip from Austin.

Texas's oldest bakery serves authentic German pastries, including legendary strudel.

The world's largest squirrel statue clutches a pecan bigger than your head.