Baku is easiest to understand as three cities built one after another on the same stretch of Caspian shoreline, each visibly different from the last, and walking through all three in order tells you more about the city than visiting any single layer alone.
Layer one: the walled Icherisheher
Icherisheher, the Old City, is Baku's original walled core, and it's the part of the city UNESCO recognises as a World Heritage Site. According to UNESCO's listing, the walled city preserves evidence of Zoroastrian, Sasanian, Arabic, Persian, Shirvani, Ottoman and Russian presence layered across centuries, and its most significant structures are the 12th-century defensive walls, the Maiden Tower — which UNESCO notes may date, in part, as far back as the 7th or 6th century BC — and the 15th-century Shirvanshahs' Palace, described by UNESCO as one of the finest examples of Azerbaijan's architecture. The site was placed on UNESCO's List of World Heritage in Danger between 2003 and 2009 before being removed following conservation improvements, and it's managed today by a dedicated state reserve authority responsible for ongoing restoration and cultural programming, according to the reserve's own site.
Icherisheher is a living district rather than a sealed museum — people live and work inside its walls, alongside the historic monuments, museums and the reserve's cultural events.
Layer two: the oil-boom mansions
Immediately outside the old walls, a distinct ring of large, ornate buildings dates from Baku's late 19th and early 20th-century oil boom, when the city became one of the world's major petroleum-producing centres and a wave of newly wealthy oil industrialists built elaborate mansions and public buildings in a mix of European architectural styles. This district reads very differently from Icherisheher: wider streets, taller buildings, and a more overtly European architectural vocabulary reflecting the international wealth and ambition of the period, funded directly by the oil wealth described in more detail in VoyageWindow's separate guide to Baku's oil industry.
Layer three: the modern towers
Beyond the oil-boom district, particularly along Baku's Caspian waterfront, a third layer of visibly contemporary architecture has developed, including large modern towers that have become part of the city's contemporary skyline. This layer represents Azerbaijan's more recent oil and gas wealth and its associated construction boom, a different economic era from the one that built the mansions in layer two, even though both ultimately trace back to the same underlying resource.
Reading the three layers together
Walking from Icherisheher outward, through the oil-boom mansion district, and on to the modern waterfront towers follows Baku's actual chronological development rather than jumping between eras at random. Each layer was built by a different set of hands under a different political and economic system — the walled city across many centuries of regional rule, the mansion district by private oil wealth in the late Russian imperial period, and the towers by the modern independent state's own energy revenues — and seeing them in that order makes the contrast legible rather than just visually striking.
The Flame Towers as a fourth reference point
The Flame Towers, a trio of flame-shaped skyscrapers visible from much of the city and illuminated at night, function as a useful visual anchor when you're trying to orient yourself while walking through the older layers — from almost anywhere in Icherisheher or the mansion district, a glance toward the towers tells you roughly which direction the modern waterfront and third layer lies. This makes them a practical navigation aid as much as an architectural landmark in their own right.
Museums worth timing into your walk
Several of Icherisheher's individual monuments, including the Shirvanshahs' Palace complex, operate as ticketed museum sites within the wider reserve rather than being freely wanderable structures, so budget separate time and, where relevant, separate entry fees for these rather than assuming the whole old town is open-access. The reserve's own site is the most reliable current source for which specific sites require tickets and what their current hours are, since this changes and this guide has not independently confirmed current admission details for individual monuments.
Why the contrast matters beyond aesthetics
The visible contrast between Baku's three layers isn't only a matter of changing architectural taste over time — it reflects three genuinely different political and economic systems that governed the same stretch of coastline in succession: centuries of regional empires and khanates, a period of private industrial capitalism under late Russian imperial rule, and the modern independent state's own resource-funded development. Recognising this gives the walk through the city a historical logic that a purely visual appreciation of pretty buildings would miss entirely.
Before you start walking
Start inside Icherisheher's walls rather than at the modern waterfront, since the old town's layout is more legible read from its historic core outward than encountered backwards. This guide does not cover specific museum opening hours within Icherisheher or entry fees for individual monuments, which the reserve's own site is the best current source for.