Phnom Penh — Capital of Cambodia

Phnom Penh sits at the confluence of the Mekong, Bassac, and Tonlé Sap rivers, a junction known locally as Chaktomuk ('four faces'), and its name literally means 'the hill of Penh,' referring to a local legend that a wealthy widow named Penh built a small hill and temple (Wat Phnom, still standing today) after finding Buddha statues washed up in the river in the 14th century. That founding legend is widely told in Cambodia even though, like many such origin stories, its precise historical accuracy is not independently verifiable.

Phnom Penh became the capital of the Khmer kingdom in 1434, after the royal court abandoned Angkor — the temple-studded capital that had anchored Khmer civilization for centuries — reportedly due to a combination of repeated invasions by the neighboring Ayutthaya kingdom and the difficulty of maintaining Angkor's elaborate irrigation infrastructure. The capital shifted between several sites over the following centuries before settling more permanently at Phnom Penh under French colonial administration from the 1860s onward.

Under the French protectorate (1863–1953), Phnom Penh was rebuilt with wide boulevards, colonial administrative buildings, and a distinctive mix of French and traditional Khmer architecture, including the Royal Palace complex, whose current buildings mostly date from the late 19th and early 20th centuries even though the monarchy's presence in the city goes back to the 1434 founding.

Phnom Penh's most catastrophic modern chapter came in April 1975, when the Khmer Rouge forcibly evacuated the entire city within days of taking power, emptying it almost completely as part of the regime's radical agrarian ideology; the city sat nearly deserted until the Khmer Rouge was overthrown in 1979, and its population only gradually returned and rebuilt over the following decades. The Tuol Sleng Genocide Museum, a former high school converted into the Khmer Rouge's S-21 prison and now a memorial, sits within the city as a documented record of that period.

Since the 1990s, Phnom Penh has rebuilt into Cambodia's political, economic, and cultural center, with substantial foreign investment — much of it from China — funding a wave of high-rise construction along the riverfront and in newer districts, a visible contrast to the city's near-total emptiness less than half a century earlier.

Phnom Penh's Central Market (Phsar Thom Thmei), a striking Art Deco domed structure completed in 1937 under French colonial rule, remains one of the city's architectural landmarks and one of the largest markets in Southeast Asia at the time of its construction, its cruciform yellow-domed design still functioning as a working market today rather than a preserved relic.

Just outside the city, the Choeung Ek Killing Fields — one of hundreds of mass execution sites used by the Khmer Rouge between 1975 and 1979 — is now a memorial and museum documenting the Cambodian genocide, in which an estimated 1.5 to 2 million people died from execution, forced labor, and starvation; together with Tuol Sleng in the city itself, it forms the core of how Phnom Penh publicly commemorates that period.

Since the 2000s, Phnom Penh's economy has also come to rely heavily on garment manufacturing for export, an industry employing hundreds of thousands of workers, many of them women who migrated from rural provinces, and the sector has made Cambodia one of the world's larger apparel exporters even as questions about factory labor conditions have periodically drawn international scrutiny and prompted reforms.

The Royal Palace complex's Silver Pagoda, so named for the more than 5,000 silver tiles covering its floor, houses a collection of Khmer royal treasures including a gold Buddha statue set with diamonds, and the palace grounds remain the official residence of Cambodia's monarch, a position that continued even through the Khmer Rouge period, though the royal family itself was largely sidelined from real political power during those years.