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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A small troop of Japanese macaques live peacefully in the heart of this Tasmanian city.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

A massive Montreal stadium that has seen nothing but trouble since its inception.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A music-filled, booze-soaked oasis in the desert.

A fake town founded by Western movie stars is now becoming a hip desert community.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Singapore's oldest Hindu temple.

Singapore's landscaping project is home to 18 incredible Supertrees.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The busy transport hub is home to the tallest airport slide in the world.

Watch butterflies take flight before you fly.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."