According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

Τhis feline monument commemorates fallen soldiers on a field that saw many, many battles.

A large collection of ancient runestones decorates this university courtyard.

A Roman temple perched over an Italian town, forgotten several times over.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

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

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

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

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

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

Built in a perfect square, this archaeological site is one of the largest and best preserved ancient fortifications in India.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

The last permanent exhibit dedicated to the Soviet leader.

A replica of the straw hut where Vladimir Lenin lived in hiding, disguised as a hay farmer, in 1917.

The powerful party began with a secret meeting in this shikumen in 1921.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Once thought to be the Garden of Eden it holds a holy footprint claimed to belong to Adam, Buddha and Shiva.

This elaborate temple was built around one of the Buddha's teeth.

Known as the most scenic route in Sri Lanka, this train line is steeped in history and offers an unparalleled view of the country.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.