Palenque, Chiapas, Mexico - I went for an early morning walk around the site. And later on I climbed the steps of the main building. Inside you find the famous grave stone of Pacal. Unfortunately I was not the only visitor there and it was sticky, hot and humid inside the pyramid. But still I loved it!
Underwater River in Mexico (Cenote Angelita). Underneath the water of Cenote Angelita is another flowing body of water. The river is full of hydrogen sulfate, which is much heavier than normal salt water. When it sinks to the bottom, it forms a flow of its own.