Elevated freight railway turned wildly successful urban park.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

You'll find just about anything in this funky Tbilisi flea market.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

An alchemist's "magic door" stands in the middle of a Roman park.

Gods clash with machines in a power plant regenerated as a museum.

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.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The highway's southernmost spot is a beloved local attraction.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This scented city oasis was a labor of love.

Hear the quietest sound from across the dome.

Colorful murals stationed throughout Charlotte bring poetry to everyone.