A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Northern Ireland's Brobdingnagian stepping stones.

A marvel of Byzantine engineering under the streets of Istanbul.

This no man's land slicing through the island is strewn with abandoned relics of another time.

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The world's largest wooden structure.

This colorful palace is an oasis of calm amid the hustle and bustle of the Buriganga riverfront.

A series of tiny artificial islands rich with produce bob atop the surface of the lake.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

A deserted 20-lane highway runs through Myanmar's empty capital city.

This magnificent white pagoda was constructed to resemble a sacred Buddhist mountain.

Gigantic unfinished stupa and the world's 2nd largest bell.

This Buddhist monastery once housed an image of Buddha containing a 19-carat diamond.

A grand example of 19th century Burmese teak architecture, and the most significant of Mandalay's historic buildings.

This golden temple is surrounded by hundreds of stone tablets that comprise the "world's largest book."

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

The most playful of the life-sized statues that make up Singapore's "People of the River."

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Singapore's landscaping project is home to 18 incredible Supertrees.