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1. Vieng Xai Caves
The extensive network was used as a safehaven from American bombardment during the Second Indochina War.
2. Chega! Exhibition
A museum documenting human rights abuses in East Timor during the Indonesian Occupation from 1974 to 1999.
3. Geba River Estuary
Guinea-Bissau's capital, Bissau, is situated where the estuary opens into the Atlantic Ocean.
4. Cape Kolka and Lighthouse
Where the Baltic Sea meets the Gulf of Riga.
5. Princess Grace Rose Garden
A municipal park memorializing Grace Kelly, wife of Prince Rainier III of Monaco.
6. Khentii Mountains
They occupy central Mongolia's Northeastern part, and house the capital of Ulaanbataar.
7. Lake Piso
The country's largest lake, near the town of Robertsport, northwest of the capital Monrovia.
8. Mount Nyiragongo
An active stratovolcano with a crater two kilometers wide and a significant lava lake.
9. El Imposibile ("The Impossible") National Park
Named for its inaccessability and perilous gorge which has claimed many lives.
10. Menengai Crater
One of the largest volcano calderas in the world, located in the Great Rift Valley.
11. Guadalcanal
The largest island by area in the Solomon Islands.
12. The Province of West Papua
Part of the western half of the large island of New Guinea.
13. Nurek Hydro-Electric Dam and Reservoir
The second tallest dam in the world, built in the 1960s and 70s by the Soviet Union.
14. Nariva Swamp
An extremely biodiverse 'Wetland of International Importance', on the East Coast of Trinidad.
15. Sistine Chapel
Famous for its magnificent ceiling painted by Michelangelo, and the site of the Papal Conclave.
16. Tareq Rajab Museum of Islamic Calligraphy
An internationally renowned collection of Arabic Manuscripts, decorated ceramics and other treasures.