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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

1513 Turkish world map, full of European state secrets and snarky commentary.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

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

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Budapest's Communist-era statues, banished to the suburbs.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A large visitor's complex and place of remembrance on the outskirts of the DMZ.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

The best place for scenic views of the DMZ and North Korea.

South Korea's largely symbolic, barely used gateway to the North.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

South Korea's only sex-themed park.