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AZUZ: Three countries, including the United States, have warned people about traveling to part of the Philippines, a nation of thousands of volcanic¹ islands located in Southeast Asia. The U.S. says it has credible² information about a terrorist threat to travelers in the Philippines'Palawan province. Military officials in the island nation say travelers will be safe.

The Philippines isn't a particularly large country in land area. It's a little bigger than the U.S. state of Arizona, but its islands are spread out over several hundred miles and because they're so pristine³, with everything from diverse marine⁴ life to unique and fascinating calderas, its appeal to tourists is as clear as the waters around it.

PAOLO RENIVA, VOLCANOLOGIST, TAAL OBSERVATORY⁵: Philippines originally is an archipelagic country. So, there are around 300 volcanoes. Each one of them offers a different kind of attraction.

I am Paolo Delgado Reniva. I'm the resident volcanologist of Taal Volcano Observatory.

Taal Volcano is one of the smallest volcanoes in the world, but definitely one of the most destructive and violent during its eruption⁶ activity.

This is unique because it's considered as an island within an island within an island. So, just imagine the Luzon island and there's a big caldera and the middle of it is the Taal Volcano island. And in the middle of the main crater⁷ lake is another island which is called the main crater lake island or the Vulcan Point.

Taal Lake is the main tourist attraction here in Batangas province. It attracts investors⁸ for the commercial fishing or fish farming. It attracts tourists who are interested in trekking⁹, horseback riding, or simply sailing on the Taal Lake.

UNIDENTIFIED MALE: Going up the volcano is pretty tough, I guess. But it's definitely worth it. When you guys at the top into the crater actually, it's spectacular.

UNIDENTIFIED MALE: You can literally¹⁰ see the bubbles coming out in the water. And it gives you a goose bump when you see that.

RENIVA: Anyone interested in earth sciences or interested on how volcanoes form, it's a good attraction for them.

Coming to Taal is like entering a time machine. You learn about volcanoes. You learn about the culture of the people living within the volcano. So, you learn more about the Philippines.