Ephesus/'>Ephesus contains the largest collection of Roman ruins in the eastern Mediterranean. The ruins that are visible give some idea of the city's original splendor, and the names associated with the ruins are evocative of its former life. The theater dominates the view down Harbor Street, which leads to the silted-up harbor.

The Library of Celsus, the façade of which has been carefully reconstructed from all original pieces, it was originally built c. 125 AD in memory of Tiberius Julius Celsus Polemaeanus, an Ancient Greek who served as governor of Roman Asia (105–107) in theRoman Empire  Celsus paid for the construction of the library with his own personal wealth, and is buried in a sarcophagus beneath it.[ The library was mostly built by his son Gaius Julius Aquila[ and once held nearly 12,000 scrolls. Designed with an exaggerated entrance — so as to enhance its perceived size, speculate many historians — the building faces east so that the reading rooms could make best use of the morning light.

A part of the site, Basilica of St. John, was built in the 6th century AD, under emperor Justinian I  over the supposed site of the apostle's tomb. It is now surrounded by Selçuk.

The Temple of Artemis, one of the Seven Wonders of the Ancient World , is represented only by one inconspicuous column, revealed during an archaeological excavation by the British Museum in the 1870s. Some fragments of the frieze and other small finds were removed – some to London and some to the Archaeological Museum, Istanbul.

The Odeon was a small roofed theater constructed by Vedius Antonius and his wife around 150 AD. It was a small salon for plays and concerts, seating about 1,500 people. There were 22 stairs in the theater. The upper part of the theater was decorated with red granite pillars in the Corinthian style. The entrances were at both sides of the stage and reached by a few steps.

The Temple of Hadrian dates from the 2nd century but underwent repairs in the 4th century and has been reerected from the surviving architectural fragments. The reliefs in the upper sections are casts, the originals being now exhibited in the Ephesus/'>Ephesus Archaeological Museum. A number of figures are depicted in the reliefs, including the emperor Theodosius I with his wife and eldest son. 

The Temple of Domitian was one of the largest temples in the city. It was erected on a pseudodipteral plan with 8 x 13 columns. The temple and its statue are some of the few remains connected with Domitian

At an estimated 24,000 seating capacity, the Theater is believed to be the largest outdoor theater in the ancient world.

The Tomb/Fountain of Pollio was erected in 97 AD in honor of C. Sextilius Pollio, who constructed the Marnas aqueduct, by Offilius Proculus. It has a concave facade.

There were two agoras, one for commercial and one for state business.

Ephesus/'>Ephesus is believed to be the city of the Seven Sleepers. The story of the Seven Sleepers, who are considered saints by Catholics and Orthodox Christians and whose story is also mentioned in the Qur'an, tells that they were persecuted because of their belief in God and that they slept in a cave near Ephesus/'>Ephesus for centuries.