Puerto Princesa Underground River, Philippines

The Puerto Princesa Subterranean River National Park is a protected area of the Philippines located about 80 kilometres (50 mi) north of the city centre of Puerto Princesa, Palawan. The river is also called Puerto Princesa Underground River. The entrance to the subterranean river is a short hike or boat ride from the town Sabang.

In 2010, a group of environmentalists and geologists discovered that the underground river has a second floor, which means that there are small waterfalls inside the cave. They also found a cave dome measuring 300 m (980 ft) above the underground river, rock formations, large bats, a deep water hole in the river, more river channels, and another deep cave, as well as marine creatures and more. Deeper areas of the underground river are almost impossible to explore due to oxygen deprivation.

It was listed as a UNESCO World Heritage Site in 1999. Also Puerto Princesa Underground River was provisionally chosen as one of the New7Wonders of Nature in 2012.

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​Carrick-a-Rede Rope Bridge

This is a famous rope bridge in Northern Ireland. The bridge links the mainland to the tiny island of Carrickarede. It spans 20 metres (66 ft) and is 30 metres (98 ft) above the rocks below. The bridge is mainly a tourist attraction. In 2016 it had 440,000 visitors.The bridge is open all year round (subject to weather).

It is thought salmon fishermen have been building bridges to the island for over 350 years. It has taken many forms over the years. In the 1970s it had only one handrail and large gaps between the slats. A new bridge, tested up to ten tonnes, was built in 2008 at a cost of over £16,000.

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