Constructed thousands of years ago, these stone circles offer incredible insight into the lives of the people who built them.

The library's graceful rotunda is like a bibliophile's temple.

Cougar Annie earned her nickname after shooting 60 cougars over the years as well as 80 black bears who threatened her garden.

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

The tree is thought to be the oldest oak in Texas and was once crowned state champion for its monumental size.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

There are two dozen tanks just sitting in an open field in Lower Saxony.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The composer did some of his finest work in this country home, including "The Nutcracker."

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

A retrofuturistic art installation in the Pittsburgh Airport.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

Lima’s Museum of Anthropology is lined with thousands of elongated human craniums.

A second generation sun-powered marvel lights up the night.

This Toronto garden collects stares and tchotchkes in equal measure.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

Every color in the rainbow awaits.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A giant gleaming memorial named for a coal miner who gave his life to the pits.

Where experiments are conducted on all things wood.