Swallows Nest, Ukraine
Built in 1911 on a 130ft high cliff. It now houses an Italian restaurant.
Hermitage Castle, Scotland
What remains was built in the 14th-15th Centuries. It is now just a shell but the impressive arches were built in the 19th Century. It was home to several vicious owners who not only committed some nasty crimes but also met ghastly endings.
Butrón Castle, Spain
Originally built in the middle ages, what remains today is mostly 18th Century stonework. It was built to be pretty rather than functional and fell into disuse eventually.
Penrhyn Castle, Wales
Built in 1820 from pink sandstone, the medieval-themed exterior of the castle houses comfortable and luxurious family rooms.
Predjama Castle, Slovenia
First mentioned in the 13th Century, this castle is built into a natural alcove in the rock. What stands today was built in the 16th Century.
Photo credits: http://www.snowdonviewpark.co.uk/local-amenities.html