Lake Toba is another of the island's spectacular sights - a remarkable volcanic crater set in the middle of northern Sumatra, 176km from Medan. The lake is huge (the largest in South-East Asia), occupying the caldera of a giant volcano that collapsed on itself after a massive eruption some 100,000 years ago.

Madinah, officially Al Madinah Al Munawwarah, is a city in western Saudi Arabia with a central place in Islamic history and religious life. The city developed around an oasis and is surrounded by volcanic hills and rocky terrain, giving its urban landscape a distinct setting. At its heart stands Al Masjid an Nabawi, the Mosque of the Prophet Muhammad, which is one of the most important religious sites in Islam.

New Delhi is the planned central district of India’s capital, laid out with broad avenues, formal gardens, government buildings, and prominent public landmarks. Designed around ceremonial spaces and tree-lined roads, it contrasts with the dense lanes and historic neighborhoods of Old Delhi. Rashtrapati Bhavan, Parliament, India Gate, and Kartavya Path form some of the district’s defining landmarks.

Fresno is a major city in California’s San Joaquin Valley, positioned between the Sierra Nevada and the Coast Ranges. Its flat agricultural surroundings are among the most productive farming areas in the United States, with orchards, vineyards, vegetable fields, and citrus groves extending beyond the urban area. Fresno also serves as a regional center for education, healthcare, business, and transportation.

Trebinje, the southernmost city in Bosnia and Herzegovina, sits just a short drive from the Adriatic coast but offers a completely different rhythm. Framed by hills and set along the Trebišnjica River, the city has a history stretching back to Roman times. The river that winds through the city is one of the longest sinking rivers in the world and often disappears underground and resurfaces in various places.