A unique set of caves that spits waves back out into the ocean.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A whimsical bridge adorned with decorative dragons.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

These warring psychedelic crags commemorate an unsuccessful military operation.

A tiny church on a man-made island in the Adriatic.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Flying high over the small island of Zákynthos is a giant tribute to the mainland.

After being destroyed by two separate fires, this monastery is now home to a small zoo and relics from dozens of saints.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Structure built from the skulls of vanquished foes.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.