One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

Once considered one of the three great Augustinian churches in the Iberian world.

When new viceroys were elected, they passed through this arch to cement the title.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

World's most expensive home.

This 17th-century mausoleum is topped with an acoustic marvel.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

The remains of what was, not so long ago, the world's largest city.

An homage to the medieval rulers of Bulgaria.

Sofia's legislative center is continuously reinventing itself.

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

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

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

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

An abandoned saucer-shaped monument in the Bulgarian mountains.

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.