One of the holiest places in the region, devotees come to Tirta Empul to bathe in the holy spring water.

Hindu temple of the dead home to hundreds of long-tailed macaques.

The site where the summer solstice helped ancient Greeks sync the lunar and solar calendars.

A Byzantine-era church hidden in a wooded area below the Acropolis.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

These caves secretly held national treasures during World War II.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

Legend says this sacred tree was a gift from goddess Athena.

This abandoned shopping arcade has new life as an art installation.

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

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Where commuters walk through remnants of an ancient Greek necropolis.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

This century-old, family-run bakery specializes in loukoumades, a Greek doughnut once served to ancient Olympians.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

Special benches that play Chopin's music are scattered throughout his native city.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

This hidden collection of everyday objects illustrates life within communist Poland.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.