A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

These ancient pecked images are among the oldest and best-preserved in Mongolia.

Hidden treasures belonging to Mongolia's most revered and multi-talented monk spent decades buried in the Gobi desert.

People have been scribbling on this massive chunk of granite for more than 1,500 years.

An exceptional assortment of fossils recovered from private collections.

This spiritual landmark for practicers of Shamanism is drenched in milk and vodka and covered in blue scarves.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

A once-fairy tale mansion now stands in a state of disrepair.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

A perfectly preserved hill village where the buildings are painted like white lace.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Rock carving created 1,300 years ago 75 feet off the ground.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.