An ancient Greek monument and a Byzantine church coexist inside this cave.

Legend says this sacred tree was a gift from goddess Athena.

According to legend, this ancient column contains healing properties.

The oldest continuously inhabited private home in the United States.

Admire an ever-changing landscape of stone sculptures.

The giant stump of the once towering cottonwood where Ute people held tribal meetings.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

An ancient Viking village in North America that predates Columbus by 500 years.

This rocky spread has been squeezed up directly from the bowels of the earth.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

A very big rock just plopped down in the New England woods.

A showcase of geologic history is home to one of the largest collection of lunar meteorites on Earth.

A stretch of New Hampshire lake water is the only ice runway in the lower 48 states that is FAA-approved.

The early 20th-century home features cutting-edge technology of the day, such as ammonia refrigeration and needle showers.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

A patch of contaminated land reclaimed as a scrappy sculptural oasis.

From lefty Jewish gathering site to hip cultural site in just 80 years.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.