The colorful stairs are made with marble from the world's major quarries.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

360° views of the city plus five floors of optical illusions and hands-on science.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

The lasting remains of a bygone era of open-air meat markets.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

A free public golf course hides in plain sight in the heart of Scotland’s capital.

An American ghost town hides along a side street in Scotland's capital.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A book bound in the skin of an infamous criminal, along with countless other specimens.

A remarkable feat of Victorian engineering across the Firth of Forth.

Aside from denoting a public square or market, this medieval structure was also a sign of a town's prosperity.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

Journey through this open museum where even employees remain true to period.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A statue representing a lost Roman profession that was vandalized for centuries.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.