Hoax, mistake, or evidence of dinosaurs in human times?

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

Op-art architecture designed for happiness.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

Romania's triumphal arch looks out over Bucharest.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

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

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

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Sofia's legislative center is continuously reinventing itself.

An homage to the medieval rulers of Bulgaria.

A vast Communist-era exhibition space in the Bulgarian capital.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

Rock carving created 1,300 years ago 75 feet off the ground.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

An old slave lookout in Cuba's historic sugar cane fields.