Coimbra, Portugal. Country's medieval capital. Buzzing ancient university town. Stay....Hotel Quinta das Lagrimas in the old house. Visit uni library. Shop around Rua do Quebra Costas. Eat at Loggia Restaurant in the museum with views of dome of Se Velha cathedral and Mondego river.
The Batu Caves in Malaysia are one of the most famous grottos in the world, known for their Hindu temples and the 100m high open vault called the Cathedral Cave. The caves are made up of 400 million year old limestone.