Monasteries on rock pillars, once accessible only by frayed ropes.

Believed to be the only Orthodox church in the world that features a free-standing pulpit.

Roman ruins top white travertine terraces formed by ancient hot springs.

A deadly ancient portal to the underworld.

A charming beach town in Turkey captures all the colors of the rainbow.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

This stone figurine was made more than 6,000 years ago and depicts a female deity of the Neolithic Vinča culture.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

Bits and pieces from the ill-fated Donner Party's winter cabins.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.

A watering hole where the options for seating include a bar, patio, or subterranean cave.

This fully intact Neoclassical-Greek Revival style firehouse operated until 1938.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

Established in 1853, this crumbling cemetery sits forgotten on the corner of Church and Chapel in Gold Country.

The oldest continuously operating Catholic school west of the Mississippi.

A middle school sports field that many believe was the true location of the first successful powered flight - and not by the Wright Brothers.

The first U.S. town to secede from the Union, only to vote themselves right back in.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.