These temples are among the oldest free-standing stone buildings in the world.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A Christian pilgrimage site that may have also been a temple for the Greek goddess of love.

One of the best-preserved medieval streets in Europe.

This extraordinary project brings water from the Colorado River to Southern California.

A dramatic coastline that’s home to a rare pine tree.

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

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

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

These caves secretly held national treasures during World War II.

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

Recently restored menagerie of Victorian-era beasts.

In a resort town where the real Alice spent her summer holidays, iconic characters create a curious trail.

The artwork that Italians felt California didn't deserve.

Nancy Thompson's Home from "A Nightmare on Elm Street."

These unusual rooms on wheels are holdovers from the 1960s.