In spite of its sophisticated sciences and developed writing system, Mayan culture collapsed around A.D. 1100 in circumstances that have gone mostly unexplained. Scientists have recently found compelling evidence that two 100-year droughts may be to blame for the mighty culture’s demise. | Via Travel + Leisure
The anniversary of the fall of the Berlin Wall is commemorated this weekend with Lichtgrenze, an art installation of illuminated helium balloons stretching eight miles through the city center. Via Travel + Leisure
Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine 300 metres ft) below the surface in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, some of the largest natural crystals ever found.