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

Flamboyant architecture from the turn of 20th century.

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

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

A map store filled with original Cold War era Russian maps of the world.

3,000 market stands in five former Zeppelin hangars.

Double spiral staircases are not unheard of, but they are very rare.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

This 135-year-old weather station studied the effects of the climate on human health.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

A mural recalls a fictional woman who once lived at 23 Quai du Commerce, 1080 Brussels.

One of Hollywood's most iconic actresses was born in an upscale Brussels neighborhood in 1929.

Perhaps the most obscure, simplistic Banksy installation found in Bristol or in the entire world.

Discovered in a peat bog, these horned helms come from a thousand years before the Viking Age.

Denmark’s ultra-modern library hides a treasury of rare, unique books.

Hidden away in a back alley, this Art Nouveau cafe has been in business since 1882.

Right beyond the Uzbekistan-Tajikistan border lies the oldest human settlement in Central Asia.

Smack-dab in Campania’s volcanic fields, this scenic lake was once thought to be the gate of hell.

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

This whimsical fountain depicts a winged siren shooting water out of her nipples into the fires of Mount Vesuvius.

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.