The remains of a former colonial fort on a stretch of beach that is occasionally visited by crocodiles.

One of Indonesia's tallest, this waterfall takes a 390-foot plunge into the Lake Toba caldera.

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

Limestone outcrop decorated with a large laser engraving of the Buddha.

A tangible and sobering reminder of an atrocity that took place during a secret war.

Legend says this sacred tree was a gift from goddess Athena.

A massive collection of petroglyphs dating back some 40,000 years.

In the middle of a busy residential neighborhood, a small roofless church being reclaimed by nature.

These tiered rice paddies were carved into the hillsides 2,000 years ago.

This record setting conveyor belt system can even be seen from space.

The remains of a Zoroastrian temple that bore witness to a time when Aden was a flourishing trading hub.

A little-known caravanserai hidden among farmhouses in the Turkish countryside.

This Khmer-era temple includes a lintel that was stolen and displayed at the Art Institute of Chicago for years before returning to Thailand.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

One of the oldest colonial buildings still standing in South America.

Trees emerge from the surface of this small man-made reservoir.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

A quaint village where bomb casings from the Second Indochina War have been repurposed into mundane objects.

This fort dates back to 1588 and was colonized by the Portuguese, Dutch, and English and sits prominently on the Indian Ocean where azure water lap the coast.

The trunk of this 700-year-old tree measures more than 60 feet around, making it the oldest and largest baobab in Sri Lanka.

According to myth, there's a bloody explanation for the beautiful bright red color of this rock formation set amidst alpine vegetation.

The beehive-like buildings of this abandoned resort reside near the border of Mauritania and Senegal.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

This human-made pond is part of a Korean palace complex first built in the 7th century.