The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A monument completed by a Third Reich sculptor in 1935 in Ankara's central park encourages Turks to "be proud, work hard, and have trust."

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

The ruined doorway is a portal to the building's turbulent and torturous past.

Roman ruins top white travertine terraces formed by ancient hot springs.

Mediterranean castle on a tiny Turkish island.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

The ornate miniature mansions were built for Istanbul's feathered residents.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

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

One of the most exquisite Lycian hilltop citadels in Turkey.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

A monument to the Turkish librarian who delivered books on the back of a donkey.

This 470-meter-long dripstone cave was discovered by chance in 2006.

A mosque with distinctive modern features.

The legendary wooden horse that stands in modern Troy is a prop from the 2004 Wolfgang Petersen film.

The hallucinogenic center of the ancient world.

An ancient Greek monument and a Byzantine church coexist inside this cave.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The Lobotesis family has been baking some of the best savory pies in Athens since 1910.