Nice pix. Are they US landmarks? Is the bottom photo related to the top two?
The first two are not in the US. I got those pics from a site called www.thecoolhunter.com/lifestyle. The third on is from a dam in Washington, I believe. That is an intake for water that deposits it into a creek on the other side of the dam. It is a much more glorious glory hole.
Search Google images with the URLs to find the source of the images:
Devetashkata Cave - Bulgaria
Baatara Gorge Waterfall, Tannourine - Lebanon
Monticello Dam is a dam in Napa County, California, United States constructed between 1953 and 1957. The dam is noted for its classic, uncontrolled morning-glory type spillway.[1] The diameter at the lip is 72 ft (22 m). Locally, the spillway is also known as ‘The Glory Hole’. [2]