Luminaries of all stripes have sipped strong Greek coffee at this cafe since 1839.

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

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

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

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

This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

These caves secretly held national treasures during World War II.

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

These ancient ruins hide in plain sight next to a dessert shop.

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

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

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

This 18th-century dissection theater's frescoes display a gorgeous tension between the terrestrial and esoteric.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

The capitol city's oldest existing cemetery.

The fossilized remains of ancient California redwoods.

California's own majestic geyser is powered by a subterranean volcano.

A gathering of green robots at the Googleplex.

From the Difference Engine to the Cray-1, all under one roof.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

800 apricot trees honor Silicon Valley's agricultural history.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

At night, this glittering musical tunnel draws skaters and photographers.