An ETA bomb killed thirteen at Puerta del Sol

A bombing kills thirteen near Andersen's old inn

The shadow of ETA hangs over the file to this day.

Look for a small plaque at your feet or on the wall nearby: it marks the site of the Fonda de La Vizcaína, an inn where Hans Christian Andersen lodged in 1862 and recorded the fact in his diary — a Danish storyteller passing through the exact ground you occupy.

Just beside that, another plaque recalls the Monasterio de San Felipe, founded here in 1547. Its famous *gradas* — steps running along the church — became Madrid's most notorious gossip exchange, the "mentidero," a place, the inscription says, "de donde salían las nuevas primero que los sucesos" — where the news came out before the events themselves had even happened. Rumour outран reality on this exact patch of pavement for over two centuries.

A short step from the monastery plaque, at 11 Plaza de la Puerta del Sol, a pensión once housed a young Jorge Luis Borges — no, this one is Borges: in 1920 he lived here and wrote his first ultraist poems in this rooming house, a quiet literary origin folded into a square better known for crowds and grapes.

Nearby, a plaque for the photographer Amador Cuesta Barrientos — "Amador" — marks the studio where, from the 1880s, the leading faces of the era came to sit for his camera. Another, for the poet Manuel José Quintana, notes simply that he lived and died here, on 11 March 1857.

The centre of the square holds the Kilómetro Cero, the zero-point from which all of Spain's radial highways are measured — every road sign to Cádiz or Barcelona ultimately counting distance from this stone. Behind it stands the Real Casa de Correos, now the seat of the Community of Madrid's government, its facade watching over the crowds who gather here each New Year's Eve for the ritual of the twelve grapes.

A pub births a party, a bomb echoes nearby

A little further along Calle del Correo, the same 1974 bombing echoes through the district's memory — Casa Labra, the pub where Pablo Iglesias founded the Spanish Socialist Workers' Party on 2 May 1879, stands within the same short radius, a place of political birth rather than destruction.

Near San Ginés church, a plaque recalls the soldier and adventurer Fray Alonso de Contreras, imprisoned there in 1608 after a life of piracy and swordplay. Nearby, Giacomo Casanova lodged at the Fonda de la Cruz between 1767 and 1768, and the playwright behind Spain's Golden Age theatre premiered work at the Corral de Comedias de la Cruz.

The Santa Cruz Palace, a few streets south, began as a Habsburg jail before Philip IV converted it into government offices in 1767 — three centuries of prisoners and diplomats passing through the same rooms.

Pleistocene gravel underlies a square built for kings

A few hundred metres southwest, the Plaza Mayor has watched executions, bullfights, and royal proclamations since its construction began in 1580, its uniform balconies once packed with spectators for the *autos de fe* of the Inquisition. The Convent of Las Descalzas Reales, founded by a princess turned nun, still holds royal treasures within its cloistered walls to the northwest.

Underneath all of it — the plaques, the grapes, the bombs, the kings — lies a bed of Pleistocene gravel, sand, and silt, alluvial deposits laid down as the Manzanares wandered its floodplain, resting atop older Miocene marls and gypsum. Madrid's centre was built on soft, workable ground, easy to dig and easy to build tall on, which is part of why a city meant to be provisional — a court moved here almost by royal whim in 1561 — became permanent instead.