A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

This Brazilian astronomy museum allows guests to gaze at the stars through their telescopes each weekend.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This subterranean necropolis holds three floors of antler-dug grave caves.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This Italian ski resort rose to fame when Benito Mussolini was held prisoner there and then rescued by the SS.

Breathtaking and huge 430 year old maps of Italy.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A sculpture serving as an homage to Pope John Paul II.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

2300-year-old Roman road connecting the empire.