This historic 19th-century building was the center of British trade and diplomacy in Taiwan.

This unique blend of Japanese and Western architecture provides a glimpse into the lives of the Japanese elites who once ruled Taiwan.

A museum commemorates what was once the largest freight station in Taiwan.

A 100-year-old Japanese command center is now a unique underground university walkway with periodic exhibits.

Taiwan's first stone fortress is also the best preserved Qing Dynasty-era city on the island.

No children ride down this antique concrete slide.

High rises built to house displaced military personnel and their families form a unique cylindrical shape.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The ancient latrines of the Greeks, in all their public glory.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Have tea in a cemetery with a dazzling view of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

Byzantine emperors ruled, lived, and died in this 13th-century palace-turned-museum.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Quite possibly the oldest love poem known to humankind.