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

Strange physical sensations and optical contradictions keep visitors coming back for more.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This freshwater spring fills with 10,000 gallons of water per minute.

Macabre astrological automaton clock dating to the late 1400s.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The final resting place for the remains of 143 Habsburg royalty.

This stunning concert hall has become a symbol of Iceland's national recovery.

The largest whale museum in Europe allows visitors to walk among life-size giants.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

Walk in the footsteps of the gods and straddle two tectonic plates.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The first archaeological site discovered by aerial photography.

Famously misunderstood wonder of the ancient world

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Ice cream stand, snack bar, and time capsule of milk conveyance.