I've never been, but...
Source: Wikimedia Commons
This otherworldly place is Rio Secreto, Mexico's underground river.
I've never been here, but you can find it in Ukraine. It's a former industrial railway now known as the Green Mile Tunnel or Tunnel of Love.
Source: Wikimedia Commons
Source: unbelievableinfo.com
And I've never been here, but these colorful rock formations can be found in the Zhangye Danxia Landform Geological Park in China.
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