1. The Morning Glory Pool in Yellowstone National Park, Wyoming.
This peculiar hot spring, located in the upper geyser basin area of Yellowstone National Park, gets its impressive color from the bacteria that inhabit it.
2. The Ancient City of Petra, Jordan.
3. Prasat Angkor Wat in Angkor, Cambodia.
4. The Shwezigon Pagoda in Bagan, Myanmar.
The Shwezigon Pagoda, one of many ornate Buddhist shrines in the region, was built between 1084 and 1113 AD.
5. The Hvítserkur Rock off the shore of Húnaþing vestra, Iceland.
6. Uluru in Australia.
Also known as the Ayers Rock, this 1,142-foot-high sandstone formation is located almost smack-dab in the center of Australia. It is most well-known for the extraordinary red glow it takes on at dawn and dusk.
7. The Reed Flute Cave in Guilin, China.
The Reed Flute Cave is a 180-million-year-old natural limestone cave which gets its enchanting color from artificial lights.
8. The Cadillac Ranch in Amarillo, Texas.
The Cadillac Ranch is a sculpture comprised of 10 different models of Cadillacs, all planted nose-first in the ground at the same angle as the Great Pyramid of Giza. Visitors to the site are welcomed - and even encouraged - to write graffiti on the vehicles.
9. Salar de Uyuni, Bolivia.
The salt flats in this region of Bolivia cover over 4,000 square miles, making them the world's largest. As much as 70% of the world's lithium reserves are contained in the brine underneath the flats' thick salt crust.
10. The Neuschwanstein Castle in Schwangau, Germany.
11. The Underground Basilica Cistern in Istanbul, Turkey.
The Basilica Cistern is one of hundreds of cisterns located under Istanbul and the most impressive, both because of its large size and cathedral-like structure.
12. The Mont Saint-Michel in Normandy, France.
13. The Dragon's Blood Trees of Socotra, Yemen.
These unusual trees get their name from their red sap which is said to resemble blood. They are uniquely beautiful because of their thick, dense branches and ruby tint.
14. The Northern Lights from Aurora, Finland.
15. The Doi Inthanon Pagodas in Chiang Mai, Thailand.
These pagodas sit on the highest peak in Thailand. People come to the Doi Inthanon Pagodas for the spectacular waterfalls and to pay their respects to the Buddha relic inside.