The hook
Iran's sprawling, mountain-backed capital, where the old shahs' mirror-tiled palaces and a dazzling vault of crown jewels sit amid a chaotic modern metropolis of galleries, cafés, and famously heavy traffic.
01Why it's worth it
Tehran is not pretty, but it is where modern Iran reveals itself. Under the snow-capped Alborz mountains, the city holds the legacy of the Qajar and Pahlavi dynasties: the mirror-worked halls and gardens of the Golestan Palace, the lavish Sa'dabad and Niavaran palace complexes of the last shah, and, most jaw-dropping, the National Jewelry Treasury, a bank vault displaying one of the world's most staggering collections of crown jewels, including a globe made of thousands of gemstones. Strong museums cover Persian antiquity and contemporary art, and the grand bazaar is a city within the city. Away from the sights, Tehran's café culture and its educated, engaged young people give the best sense of everyday Iranian life and its complexities. It is big, congested, and takes patience, but it earns a day or two before heading to the historic cities.
02How to experience it
See the Golestan Palace and the astonishing crown jewels (limited opening hours, so check), and pick a palace complex and a museum. Escape the traffic on a walk in the Alborz foothills or a café in the north of the city, where you'll meet young Tehranis. As with all of Iran, check current travel advice.
The honest note
One practical fact dominates every traveller account and has outlasted all of them: international sanctions mean foreign-issued bank cards do not work in Iran. Visa, Mastercard and foreign ATMs simply fail, so visitors carry the whole trip's budget in cash — euros or dollars — and change it locally. As one long-stay traveller put it, "for now you need to bring in cash; USD or euros are best."
Entry rules change often and by nationality, and several nationalities have at times needed a guided tour rather than an independent visa. Note also that visiting Iran can affect later visa-free entry to the United States. Verify all of this current before planning — the traveller reports in this corpus are a decade old on the details, even where the cash reality still holds.