World's largest bell sits on the grounds of the Kremlin in Moscow.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Old Danish castle immortalized in Shakespeare's Hamlet.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A diminutive statue that was inspired by the sculptor's own daughter.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

An ancient necropolis of magnificent tombs.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

See gorgeous frescoes at this modest Byzantine place of worship.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

Gigantic water vessel, permanently grounded in Southern Albania.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.