From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

Six beautiful wooden giants are hidden around Copenhagen.

A natural wonder in south Denmark.

An elevator into the Baltic Sea.

The first (but not only) upside-down house in Germany.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Two monstrous faces loom over a village in Czechia.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.