It is in the 小門地質公園 at 西嶼. It is not really cave but a natural bridge caused by erosion. It is interesting to see, but it is better to hike to the end and see the 跨海大橋，it gives the best view of the bridge.
You can enjoy some culture when you stop by Xiaomen Geological Museum in Siaomen Island. While you're in the area, stroll along the marina.
You can find out about the history of Xiyu with a stop at Zhuwan Dayi Temple. While you're in the area, wander around the natural setting.
You can enjoy some culture when you stop by Xiyu Crab Museum in Xiyu. While you're in the area, stroll along the marina.
Explore the waterfront in Xiyu with a trip to Heng-chiao Fishing Harbor. While you're in the area, wander around the natural setting.
Learn about the local history of Baisha with a stop at Kuahau Bridge. Stroll along the marina or visit the monuments while you're in the area.
You can find out about the history of Tongliang when you stop by Penghu Great Bridge. Amble around the area's marina or visit its monuments.
