A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

The most confusing clock in New York.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

There must be a pun in this haystack somewhere...

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This chimerical bridge/tunnel appears to dead end right into the sea.

This European portal tomb has a capstone that weighs around 150 tons.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.