A moon bridge is a highly-rounded arched pedestrian bridge associated with gardens especially in China and Japan, where the design originated. In many areas, moon bridges are purely decorative, but at one time this type of bridge was originally designed to allow pedestrians to cross canals while allowing the passage of barges beneath. When constructed using the climbing ascent and descent, it has the further advantage of not using space from the adjoining fields for approaches to the bridge. The visual effect of this bridge makes it a popular design for gardens, particularly those with water or small paths.
info source: wikipedia
Moon bridge in The Japanese garden at Huntington Gardens in San Marino, California.- By https://www.flickr.com/photos/randysonofrobert/ – https://www.flickr.com/photos/randysonofrobert/464791157/, CC BY 2.0, Link
Jade Belt Bridge at the Summer Palace, Beijing – By Hennessy – Own work, CC BY-SA 3.0, Link
Celestial Bridge – By Cryptojoe – Own work, CC BY-SA 3.0, Link
The Twenty Four Bridge in the Thin West Lake,Yangzhou – By Gisling – Own work, CC BY 3.0, Link
Tongyuan Bridge, Taiwan – By Solomon203 – Own work, CC BY-SA 4.0, Link
Jindai Bridge, Dahu Park, Taipei City. – By 玄史生 – Own work, CC BY-SA 3.0, Link
A moon bridge in Magnolia Gardens, US – By mogollon_1 – DSC_2695, CC BY 2.0, Link
e MORFES 
Love those types of bridges! Great!
Stunning! The last picture was my favorite
FAntastici ponti, che sbigottino per le loro diversificate forme
Un saluto,silvia
Wonderful structures.. thanks for sharing them