Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Welded sphere dropped from space.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Bizarre living fossil only grows in a small chunk of the Namib Desert.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

An alien church provides much needed silence in the midst of a Finland shopping center.

A collection of collections ranging from dentistry to minerals.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

Villas that once served as playgrounds for the rich now fall away in decay.

Crawling into this primordial cave may feel disconcertingly familiar.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

In the town of Třeboň, carp is king.

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

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Monasteries on rock pillars, once accessible only by frayed ropes.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Bizarrely-painted church designed by a controversial artist.

The atomic museum in the basement of this German castle displays long strands of replica uranium cubes.