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

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

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

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

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

A fountain standing as a testament to a doomed alliance.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Large miniature theme park with 100-plus models.

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

A meow-velous tribute to a beloved street cat, made famous on the internet.

A marvel of Byzantine engineering under the streets of Istanbul.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Modern sundial uses ancient methods to tell time and date perfectly.

A remarkably intact castle that once was the largest in Ireland.

A moody and picturesque riverside ruin overgrown with vegetation.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Gargoyle head that brings good luck.

A cableway for car transport.

Museum dedicated to the terror regimes of Hungary.

The oldest private art gallery in all of Hungary.