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

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

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

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

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

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

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

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

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

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

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

A memorial to the Potawatomi chief who allegedly ran nearly 150 miles to alert settlers of an impending attack.

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

A display of magnificent stained glass windows is the first exhibit of its kind.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Ancient pueblos built into the base of a natural canyon wall.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Electrical pylon in the shape of Disney's beloved mouse.

A museum preserving one company’s history of preserving food.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.