The site of the notorious Camp Sumter Prison is now a peaceful memorial.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

An ode to one of the dirtiest jobs during the construction of the Boulder Dam.

Experience a charming 1930's version of "infotainment."

These markers are used to document elevation changes around the famed dam.

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

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

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This building served as the first customs house in modern Greece.

This church is dedicated to the patron saint of seafarers.

This building was once the most magnificent mansion in Nafplio.

This 18th-century former mosque held the first Hellenic Parliament.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.