Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Poseidon? No one seems to know.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

The hallucinogenic center of the ancient world.

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

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

The ruined doorway is a portal to the building's turbulent and torturous past.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Where commuters walk through remnants of an ancient Greek necropolis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

An ancient octagonal weather station named for the eight Greek gods of wind.

A sharp sculpture made of thousands of pieces of jagged glass.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

Go through the looking glass in Tokyo's Wonderland-themed shop.