The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

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

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

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

A fountain standing as a testament to a doomed alliance.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

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

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

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

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

Gladiators once walked this ancient, subterranean passage.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

The reconstruction of this prominent building fulfilled a long-written command.

A black cat protests the City Guild in Riga's Old Town.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Stockholm's narrowest alley is barely over two feet wide.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Sweden's "good old days" painstakingly re-created in a model village.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.