An unfinished tomb carved into a giant boulder in the Arabian Desert.

Some of the freshest vegetables in Seoul are grown in a subway station.

Secret North Korean passage discovered below the world's most dangerous border.

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

Tracking the 1,500-year history of Korea's star cabbage.

The supreme shrine of the state.

The burial ground of two kings and a queen is now a calm city park in the middle of bustling Seoul.

This human-made pond is part of a Korean palace complex first built in the 7th century.

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

A church of bones, decorated with 40,000 human skeletons.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

Apartment complexes built into huge repurposed natural gas tanks.

An exquisite Baroque church in Vienna's old town.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Baroque celebration of the end of the Great Plague of Vienna.

The topiary maze at the Habsburg hunting lodge.

Inside this Krakow church, an explosion of psychedelic color.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

The first island in the world designated a light-pollution-free astronomical observation point.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.