Catholics lead the Northeast and Southwest, Southern Baptists fill the South, Mormons built their base in Utah, and Lutherans define the Upper Midwest. Each concentration traces back to immigration corridors, evangelical revivals, or planned settlements from centuries ago.
Read more: Which Religion Dominates Each US County
Ancient Rome taxed it and issued licenses for it. The Sumerians wrote about it on clay tablets in 2400 BCE. And yet in 2024, the world still runs six completely different legal frameworks for prostitution at the same time — ranging from full decriminalization in New Zealand to the death penalty in some jurisdictions.
Read more: How the World Regulates Prostitution
Most of Austria speaks Bavarian dialects, but the westernmost state sounds almost like a different language. Here’s a look at all 11 dialect zones mapped across the country.
Read more: Dialects of Austria
Mongolia is the world’s most sparsely populated sovereign state — about 2 people per square kilometer (5.2 people per sq mi). But despite all that empty space, it fits ten languages inside its borders, from Kazakh in the far west to Tungusic-speaking Evenki communities in the north.
Read more: Languages of Mongolia
Every Dutch town on a modern road sign is the latest draft of something considerably older, worn down by centuries of spoken language. This map by Victor van Werkhooven uses documented historical sources to show what the country would look like if that process had never started.
Read more: Ye Olde Netherlands: Dutch Town Names in Their Oldest Written Forms
The US passport held the top spot globally in 2006 and again in 2014. In October 2025 it fell out of the top ten for the first time in the Henley Passport Index’s 20-year history. Brazil ended visa-free access for Americans, China expanded its visa-free network to 76 countries while leaving Americans off it, and the US itself admits only 46 nationalities without a visa, ranking 77th globally on that measure.
Read more: Visa-Free Countries for US Citizens
At the time of European settlement in North America, primary or virgin forests covered nearly all of the East Coast (1 billion acres or 4 million sq. km.). By the end of the 20th century, virgin forests remained in the South. Nowadays, If we consider all forests, 37% of the United States territory (about 1/3 of the U.S.) is forested.
Read more: The forest cover of the United States mapped
The U.S. Foreign Service Institute has spent over 70 years teaching languages to diplomats, making their data about as close to real-world experience as you can get. Their rankings show a dramatic gap: Spanish takes around 24 weeks of intensive study, while Arabic or Mandarin requires 88 weeks.
Read more: Language difficulty rankings
Three of China’s national highways share endpoints at exactly three locations, closing into a 27,166-kilometer (16,880 miles) loop around the country. One section crosses the Tibetan Plateau near Mount Kailash. Another passes every major port city on the eastern coast. The third follows the northern border through Inner Mongolia and the Gobi Desert.
Read more: Three Highways That Form a 27,000-Kilometer Loop Around China
Turning on your tap in Midland, Texas is a different chemical experience than turning it on in Portland, Oregon, even though both cities call it drinking water. The difference comes down to what rock the water traveled through underground.
Read more: Where Water Is Hard or Soft in the US Mapped Out
London holds 8.8 million people across 607 square miles, but that average covers a range most cities cannot match. Tower Hamlets reaches 15,802 residents per km², Bromley sits at 2,197 per km², and the gap between them is shaped by Victorian housing, wartime rebuilding, and one of the world’s most influential planning policies.
Read more: How Dense Is London?
Europe is one continent, but in development terms it behaves more like several. From Iceland and Norway at the top of global human development rankings to Moldova and war-affected Ukraine at the other end, the differences in living standards, education, and life expectancy are significant. Why does the gap exist, and where is it actually getting smaller?
Read more: Regional Development Across Europe Mapped
In Nevada County, Arkansas, more than one in three residents is counted as a Black Protestant adherent. Three maps show how concentrated that presence is across the Deep South, and how thin it becomes across the rest of the country.
Read more: The Geography of Black Protestant America