Parabolic Arch of Tacna, Monument in Tacna, Peru.

The Parabolic Arch, formally the Monument to the Heroes Admiral Miguel Grau Seminario and Colonel Francisco Bolognesi, is an 18-metre freestanding arch on the Paseo Cívico in Tacna. It is built of pinkish quarry stone from the Intiorko and Arunta hills, the same material as Tacna Cathedral. Two bronze statues by the Campayola Foundry stand at the outer base of the tapering columns, which curve inward to a pointed apex.

Designed by German technicians and donated to Peru, the pink quarry-stone monument was inaugurated on 28 August 1957 under Manuel Prado Ugarteche, though one source gives 1959. It honours Admiral Miguel Grau and Colonel Francisco Bolognesi, both killed in the War of the Pacific. On 23 August 2018 the Ministry of Culture declared it Cultural Heritage of the Nation.

The monument is the setting for the culminating moment of the Procesión de la Bandera, held for the reincorporation of Tacna into Peru, when local and national authorities wait at the arch for the Peruvian flag before it is raised on the Paseo Cívico. About four metres away stands a bronze votive lamp decorated with eight swords and eight anchors, lit on patriotic commemorations.

The monument sits in a central plaza and is freely accessible at any time without reservations or entry requirements. The location works well for walking and offers calm periods for viewing and photography, especially in early mornings or late afternoons.

About four metres from the arch stands a bronze votive lamp decorated with eight swords and eight anchors, symbols of Bolognesi's land action and Grau's naval action. It is lit on patriotic commemorations, so the swords and anchors belong to the lamp, not to the arch itself.