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

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

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

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.

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

Hear the quietest sound from across the dome.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Where monkeys run wild and the humans are caged.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

Found: Garden of Eden in Miami-Dade County, Florida.

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.