The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

Singapore's landscaping project is home to 18 incredible Supertrees.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Too much gossip or just missing curfew could land you in here for a couple of days.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

The "Prussian Versailles" that is as glorious today as when it was built.

Largest illuminated advertisement sign in the world.

Fantastic views and thousands of love locks.

One of downtown Berlin's last reminders of its Communist past.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The encased skull that is widely believed to belong to St. John the Baptist.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.

A surreal statue honoring Prague's favorite literary son.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.